Vanilla JS

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Overview

Vanilla JS is a fast, lightweight, cross-platform tool for building incredible, powerful JavaScript applications.

Use in Development

Just put the following code:

<!-- <script src="path/to/vanilla.js"></script> -->

Use in Production

The much faster method:

Summary

Overview
- Use in Development
- Use in Production
Summary
Speed Comparison
From jQuery to Vanilla JS
- .Selector #Dom
- AJAX
  - GET
  - JSON
  - POST
  - Request / Response
- ATTRIBUTES
- EFFECTS
  - Animation
  - Hide
  - Show
- EVENTS
  - Hover
  - Load
  - Off
  - On
  - One
  - Ready
  - Trigger
- FILTERS
  - Filter
  - First
  - Item
  - Has
  - Is
  - Last
  - Not
  - Slice
- MANIPULATION
  - Append
  - Clone
  - Compare
  - Contains
  - Create
  - Empty
  - Get HTML
  - Get Node HTML
  - Get Text
  - Index From Parent
  - Insert After
  - Insert Before
  - Prepend
  - Remove
  - Remove Children
  - Replace
  - Set HTML
  - Set Node HTML
  - Set Text
  - Unwrap
  - Wrap
- TRAVERSING
  - All Next
  - All Parents
  - All Previous
  - Children
  - Closest Parent
  - Find Children
  - First Child
  - Last Child
  - Matches Selector
  - Next
  - Next Until
  - Parent
  - Parents
  - Previous
  - Previous Until
  - Siblings
- STYLES
- UTILS
  - Array Each
  - Change Futur Context
  - Extend
  - Index Of
  - Is Array
  - Map
  - Now
  - Parse HTML
  - Parse JSON
  - Parse XML
  - Serialize Array
  - Serialize String
  - Trim

Speed Comparison

When Vanilla JS perform 100 operations, others do:

Retrieve DOM element by ID

	Code	100 ops Vanilla JS
Vanilla JS	document.getElementById(‘vanilla’);	100
Dojo	dojo.byId(‘dojo’);	92
Prototype JS	$(‘prototype’);	57
jQuery	$(‘#jquery’);	42
MooTools	document.id(‘mootools’);	24

Retrieve 10 DOM elements by tag name

	Code	100 ops Vanilla JS
Vanilla JS	document.getElementsByTagName(‘div’);	100
Prototype JS	Prototype.Selector.select(‘div’, document);	25
jQuery	$(‘div’);	21
Dojo	dojo.query(‘div’);	3
MooTools	Slick.search(document, ‘div’, new Elements);	2

Vanilla JS vs jQuery

Retrieve 10 DOM elements by class name

	Code	100 ops Vanilla JS
Vanilla JS	document.getElementsByClassName(‘vanilla’);	100
jQuery	$(‘.jquery’);	25

Retrieve DOM element with `<#id> .inner span` selector

	Code	100 ops Vanilla JS
Vanilla JS	document.querySelector(‘#vanilla .inner span’);	100
jQuery	$(‘#jquery .inner span’);	17

Retrieve 10 DOM elements with `<.className> .inner span` selector

	Code	100 ops Vanilla JS
Vanilla JS	document.querySelectorAll(‘.vanilla .inner span’);	100
jQuery	$(‘.jquery .inner span’);	51

Vanilla JS Selector Performances

All tests are based on <section id="vanilla" class="vanilla"><article class="inner"><div class="target" id="target"></div></article></section> HTML.

Select node `<div class="target" id="target"></div>`	100 ops Vanilla JS
document.getElementsByTagName(‘div’);	100
document.getElementById(‘target’);	99
document.getElementsByClassName(‘target’);	96
document.querySelector(‘.vanilla .inner div’);	68
document.querySelectorAll(‘.vanilla .inner div’);	35

From jQuery to Vanilla JS

Legend

Understand each type of DOM Object:

<div class="example">
  <span>(Text into) Html Element</span>
  <!-- Comment Element -->
  Text Element
  <span>(Text into) Html Element</span>
</div>

querySelector('.example') return a HTMLElement.
querySelector('.example').children return a HTMLCollection, each collection’s item is a HTMLElement, two [span, span] here.
querySelector('.example').childNodes return a NodeList, each collection’s item is a Node, seven [text, span, text, comment, text, span, text] here.
querySelector('.example').childNodes[0] return a Text (Node) of typeNode 3, as a text. (...nodeList[3] is typeNode 8 as a Comment (Node too)).

.Node #Selector

#id

From jQuery

var htmlElement = $('#id')[0];

to Vanilla JS

var htmlElement = document.getElementById('id');

.classname #id tagname

From jQuery

var htmlElement = $('#id .classname tagname')[0];

to Vanilla JS

document.querySelector('#id .classname tagname');

[.classname #id tagname]

From jQuery

$('#id .classname tagname').each(function (i, htmlElement) {
    htmlElement;
});

to Vanilla JS

var nodeList = document.querySelectorAll('#id .classname tagname'); // Not Live (Snapshot)
[].forEach.call(nodeList, function (node) {
    node;
});

[.classname]

From jQuery

$('.classname').each(function (i, htmlElement) {
    htmlElement;
});

to Vanilla JS

var htmlCollection = document.getElementsByClassName('classname'); // Live
// var nodeList = document.querySelectorAll('.classname'); // Not Live (Snapshot)
[].forEach.call(htmlCollection, function (htmlElement) {
    htmlElement;
});

[name]

From jQuery

$('[name="name"]').each(function (i, htmlElement) {
    htmlElement;
});

to Vanilla JS

var nodeList = document.getElementsByName('name'); // Live
// var nodeList = document.querySelectorAll('[name=name]'); // Not Live (Snapshot)
[].forEach.call(nodeList, function (node) {
    node;
});

[tagname]

From jQuery

$('tagname').each(function (i, htmlElement) {
    htmlElement;
});

to Vanilla JS

var htmlCollection = document.getElementsByTagName('tagname'); // Live
// var nodeList = document.querySelectorAll('tagname'); // Not Live (Snapshot)
[].forEach.call(htmlCollection, function (htmlElement) {
    htmlElement;
});

Reverted Loop

From jQuery

$($('.className').get().reverse()).each(function (i, htmlElement) {
    htmlElement;
});

to Vanilla JS

var htmlCollection = document.getElementsByClassName('className'), // Live
    i = htmlCollection.length;
while (htmlElement = htmlCollection[--i]) {
    htmlElement;
}

AJAX

GET

From jQuery

$.ajax({
  type: 'GET',
  url: <url>,
  data: <data>
});

to Vanilla JS

fetch(<url>, {
  method: 'GET',
  body: <data>
});

/* // IE fallback
var get = new XMLHttpRequest();
get.open('GET', <url>, true);
get.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
get.send(<data>); */

JSON

From jQuery

function getJSON(url, next) {
    $.getJSON(url, function (data) {
        next(null, data);
    }).error(function () {
        next(new Error('There was a connection error of some sort.'));
    });
}

getJSON(<url>, function (err, data) {
    if (err) {
        return err;
    }

    data;
});

to Vanilla JS

function getJSON(url, next) {
    fetch(url)
        .then(function (data) {
            if (data.status >= 200 && data.status < 300) {
                return data;
            }

            next(new Error('We reached our target server, but it returned an error.'));
        })
        .then(function (data) {
            next(null, data.json());
        })
        .catch(function () {
            next(new Error('There was a connection error of some sort.'));
        });
}

/* // IE fallback
function getJSON(url, next) {
    var request = new XMLHttpRequest();
    request.open('GET', url, true);
    request.send();

    request.addEventListener('load', function () {
        if (request.status < 200 && request.status >= 400) {
            return next(new Error('We reached our target server, but it returned an error.'));
        }

        next(null, JSON.parse(request.responseText));
    });

    request.addEventListener('error', function (error) {
        next(new Error('There was a connection error of some sort.'), error);
    });
} */

getJSON(<url>, function (err, data) {
    if (err) {
      return err;
    }

    data;
});

POST

From jQuery

$.ajax({
  type: 'POST',
  url: <url>,
  data: <data>
});

to Vanilla JS

fetch(<url>, {
  method: 'POST',
  body: <data>
});

/* // IE fallback
var post = new XMLHttpRequest();
post.open('POST', <url>, true);
post.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
post.send(<data>); */

Request / Response

From jQuery

function request(url, next) {
    $.ajax({
        type: 'GET',
        url: url,
        success: function(response) {
          next(null, response);
        },
        error: function() {
          next(new Error('There was a connection error of some sort.'));
        }
    });
}

request(<url>, function (err, response) {
    if (err) {
      return err;
    }

    response;
});

to Vanilla JS

function request(url, next) {
    fetch(url)
        .then(function (response) {
            if (response.status >= 200 && response.status < 300) {
                return response;
            }

            next(new Error('We reached our target server, but it returned an error.'));
        })
        .then(function (response) {
            next(null, response);
        })
        .catch(function () {
            next(new Error('There was a connection error of some sort.'));
        });
}

/* // IE fallback
function request(url, next) {
    var request = new XMLHttpRequest();
    request.open('GET', url, true);
    request.send();

    request.addEventListener('load', function () {
        if (request.status < 200 && request.status >= 400) {
            return next(new Error('We reached our target server, but it returned an error.'));
        }

        next(null, request.responseText);
    });

    request.addEventListener('error', function () {
        return next(new Error('There was a connection error of some sort.'));
    });
} */

request(<url>, function (err, response) {
    if (err) {
      return err;
    }

    response;
});

ATTRIBUTES

Add Class

From jQuery

$(<htmlElement>).addClass(<className>);

to Vanilla JS

<htmlElement>.classList.add(<className>);

Get Attribute

From jQuery

$(<htmlElement>).attr(<attributeName>);

to Vanilla JS

<htmlElement>.getAttribute(<attributeName>);

Get Data

From jQuery

$(<htmlElement>).data(<dataName>);

to Vanilla JS

<htmlElement>.getAttribute('data-' + <dataName>);

Get Value

From jQuery

$(<htmlElement>).val();

to Vanilla JS

<htmlElement>.value;

Has Class

From jQuery

$(<htmlElement>).hasClass(<className>);

to Vanilla JS

<htmlElement>.classList.contains(<className>);

Remove Attribute

From jQuery

$(<htmlElement>).removeAttr(<attributeName>);

to Vanilla JS

<htmlElement>.removeAttribute(<attributeName>);

Remove Class

From jQuery

$(<htmlElement>).removeClass(<className>);

to Vanilla JS

<htmlElement>.classList.remove(<className>);

Remove Data

From jQuery

$(<htmlElement>).removeData(<dataName>);

to Vanilla JS

<htmlElement>.removeAttribute('data-' + <dataName>);

Set Attribute

From jQuery

$(<htmlElement>).attr(<attributeName>, <value>);

to Vanilla JS

<htmlElement>.setAttribute(<attributeName>, <value>);

Set Data

From jQuery

$(<htmlElement>).data(<dataName>, <value>);

to Vanilla JS

<htmlElement>.setAttribute('data-' + <dataName>, <value>);

Set Value

From jQuery

$(<htmlElement>).val(<value>);

to Vanilla JS

<htmlElement>.value = <value>;

Toggle Class

From jQuery

$(<htmlElement>).toggleClass(<className>);

to Vanilla JS

<htmlElement>.classList.toggle(<className>);

EFFECTS

Animation

From jQuery

function fadeIn($htmlElement, speed, next) {
    $htmlElement.css('opacity', '0').animate({ opacity: 1 }, speed, next);
}
fadeIn($(<htmlElement>), 2000, function () {
  $(this).css('opacity', '');
});

to Vanilla JS

function fadeIn(htmlElement, speed, next) {
    var last = +new Date(),
        tick = function () {
            htmlElement.style.opacity = +htmlElement.style.opacity + (new Date() - last) / speed;

            last = +new Date();

            if (+htmlElement.style.opacity < 1) {
                requestAnimationFrame(tick);
            } else if (next) {
                next.call(htmlElement);
            }
        };

    htmlElement.style.opacity = 0;
    tick();
}

fadeIn(<htmlElement>, 2000, function () {
    this.style.opacity = '';
});

Hide

From jQuery

$(<htmlElement>).hide();

to Vanilla JS

<htmlElement>.style.display = 'none';

Show

From jQuery

$(<htmlElement>).show();

to Vanilla JS

<htmlElement>.style.display = '';

EVENTS

Hover

From jQuery

$(<htmlElement>).hover(<eventHandlerMouseIn>, <eventHandlerMouseOut>);

to Vanilla JS

<htmlElement>.addEventListener('mouseenter', <eventHandlerMouseIn>);
<htmlElement>.addEventListener('mouseleave', <eventHandlerMouseOut>);

Load

From jQuery

$(<htmlElement>).load(function () {
    // I am full loaded.
});

to Vanilla JS

<htmlElement>.addEventListener('load', function () {
    // I am full loaded.
});

Off

From jQuery

$(<htmlElement>).off(<eventName>, <eventHandler>);

to Vanilla JS

<htmlElement>.removeEventListener(<eventName>, <eventHandler>);

On

From jQuery

$(<htmlElement>).on(<eventName>, <eventHandler>);

to Vanilla JS

<htmlElement>.addEventListener(<eventName>, <eventHandler>);

One

From jQuery

$(<htmlElement>).one(<eventName>, <eventHandler>);

to Vanilla JS

<htmlElement>.addEventListener(<eventName>, <eventHandler>, { once: true });

/* // IE fallback
<htmlElement>.addEventListener(<eventName>, function callee(event) {
    event.target.removeEventListener(e.type, callee);
}); */

Ready

From jQuery

$(document).ready(function () {
    // I am ready to be manipulate.
});

to Vanilla JS

document.addEventListener('DOMContentLoaded', function () {
    // I am ready to be manipulate.
});

Trigger

From jQuery

var event = jQuery.Event('click');
event.test = true;

$(<htmlElement>).click(function (event) {
    event.test; // undefined by click, true by trigger.
});
$(<htmlElement>).trigger(event);
// $(<htmlElement>).trigger('click'); // Shortcut without test property.

to Vanilla JS

var event = new Event('click');
event.test = true;

<htmlElement>.addEventListener('click', function (event) {
    event.test; // undefined by click, true by trigger.
});
<htmlElement>.dispatchEvent(event);

FILTERS

Filter

From jQuery

filterCondition

$(<selector>).filter(function (i, htmlElement) {
    return <filterCondition>;
}).each(function (i, htmlElement) {
    htmlElement;
});

to Vanilla JS

var nodeList = document.querySelectorAll(<selector>);

nodeList = [].filter.call(nodeList, function (node) {
    return <filterCondition>;
});

[].forEach.call(nodeList, function (node) {
    node;
});

First

From jQuery

$(<selector>).first();

to Vanilla JS

<htmlCollection>.item(0);
// <htmlCollection>[0];

Has

From jQuery

$(<selector>).has(<matchesChildSelector>);

to Vanilla JS

var nodeList = document.querySelectorAll(<selector>);
[].filter.call(nodeList, function (node) {
    return node.querySelector(<matchesChildSelector>);
});

Is

From jQuery

$(<selector>).is(<matchesSelector>);

to Vanilla JS

var nodeList = document.querySelectorAll(<selector>);
[].some.call(nodeList, function (node) {
    return node.matches(<matchesSelector>);
});

Item

From jQuery

$(<selector>).eq(<index>);

to Vanilla JS

<htmlCollection>.item(<index>);
// <htmlCollection>[<index>];

Last

From jQuery

$(<selector>).last();

to Vanilla JS

<htmlCollection>.item(<htmlCollection>.length - 1);
// <htmlCollection>[<htmlCollection>.length - 1];

Not

From jQuery

$(<selector>).not(<matchesSelector>);

to Vanilla JS

var nodeList = document.querySelectorAll(<selector>);
[].filter.call(nodeList, function (node) {
    return !node.matches(<matchesSelector>);
});

Slice

From jQuery

$(<selector>).slice(<startIndex>, <endIndex>);

to Vanilla JS

var nodeList = document.querySelectorAll(<selector>);
[].slice.call(nodeList, <startIndex>, <endIndex>);

MANIPULATION

Append

From jQuery

$(<htmlElement>).append($(<appendHtmlElement>));
// $(<htmlElement>).append(<appendHtmlElement>);

to Vanilla JS

<htmlElement>.appendChild(<appendHtmlElement>);
// <htmlElement>.insertAdjacentHTML('beforeEnd', <htmlString>);

Clone

From jQuery

$(<htmlElement>).clone();

to Vanilla JS

<htmlElement>.cloneNode(true);

Compare

From jQuery

var $a = $(<selectorToFirstHtmlElement>).find(<selectorToSecondHtmlElement>);
    $b = $(<selectorToSecondHtmlElement>);

$a.is($b);

to Vanilla JS

var temp = document.getElementsByTagName(<selectorToFirstHtmlElement>)[0],
    a = temp.getElementsByTagName(<selectorToSecondHtmlElement>)[0],
    b = document.querySelector(<selectorToSecondHtmlElement>);

(a === b);

Contains

From jQuery

$.contains($(<htmlElement>), $(<childHtmlElement>));

to Vanilla JS

(<htmlElement> !== <childHtmlElement>) && <htmlElement>.contains(<childHtmlElement>);

Create

From jQuery

$('<' + <tagString> + '>');

to Vanilla JS

document.createElement(<tagString>);

Empty

From jQuery

$(<htmlElement>).empty();

to Vanilla JS

<htmlElement>.innerHTML = '';

Get HTML

From jQuery

$(<htmlElement>).html();

to Vanilla JS

<htmlElement>.innerHTML;

Get Node HTML

From jQuery

$('<div>').append($(<htmlElement>).clone()).html();

to Vanilla JS

<htmlElement>.outerHTML;

Get Text

From jQuery

$(<htmlElement>).text();

to Vanilla JS

<htmlElement>.textContent;

Index From Parent

From jQuery

$(<htmlElement>).index();

to Vanilla JS

[].slice.call(<htmlElement>.parentNode.children).indexOf(<htmlElement>);

Insert After

From jQuery

$(<htmlElement>).after($(<afterHtmlElement>));
// $(<htmlElement>).after(<htmlString>);

to Vanilla JS

<htmlElement>.parentNode.insertBefore(<afterHtmlElement>, <htmlElement>.nextSibling);
// <htmlElement>.insertAdjacentHTML('afterend', <htmlString>);

Insert Before

From jQuery

$(<htmlElement>).before($(<beforeHtmlElement>));
// $(<htmlElement>).before(<htmlString>);

to Vanilla JS

<htmlElement>.parentNode.insertBefore(<beforeHtmlElement>, <htmlElement>);
// <htmlElement>.insertAdjacentHTML('beforebegin', <htmlString>);

Prepend

From jQuery

$(<htmlElement>).prepend($(<prependHtmlElement>));
// $(<htmlElement>).prepend(<htmlString>);

to Vanilla JS

<htmlElement>.insertBefore(<prependHtmlElement>, <htmlElement>.firstChild);
// <htmlElement>.insertAdjacentHTML('afterBegin', <htmlString>);

Remove

From jQuery

$(<htmlElement>).remove();

to Vanilla JS

<htmlElement>.parentNode.removeChild(<htmlElement>);

Remove Children

From jQuery

$(<htmlElement>).empty();

to Vanilla JS

while (<htmlElement>.firstChild) {
    <htmlElement>.removeChild(<htmlElement>.firstChild);
}
// <htmlElement>.innerHTML = '';

Replace

From jQuery

$(<htmlElement>).replaceWith($(<newHtmlElement>));

to Vanilla JS

<htmlElement>.parentNode.replaceChild(<newHtmlElement>, <htmlElement>);

Set HTML

From jQuery

$(<htmlElement>).html(<htmlString>);

to Vanilla JS

<htmlElement>.innerHTML = <htmlString>;

Set Node HTML

From jQuery

$(<htmlElement>).replaceWith(<htmlString>);

to Vanilla JS

<htmlElement>.outerHTML = <htmlString>;

Set Text

From jQuery

$(<htmlElement>).text(<string>);

to Vanilla JS

<htmlElement>.textContent = <string>;

Unwrap

From jQuery

$(<htmlElement>).unwrap();

to Vanilla JS

while (<htmlElement>.firstChild) {
    <unwrapHtmlElement>.insertBefore(<htmlElement>.firstChild, <htmlElement>);
}
<unwrapHtmlElement>.removeChild(<htmlElement>);

Wrap

From jQuery

$(<htmlElement>).wrap($(<wrapHtmlElement>));

to Vanilla JS

<htmlElement>.parentNode.insertBefore(<wrapHtmlElement>, <htmlElement>);
<wrapHtmlElement>.appendChild(<htmlElement>);

TRAVERSING

All Next

From jQuery

$(<htmlElement>).nextAll();

to Vanilla JS

var nextAll = false;
nextAll = [].filter.call(<htmlElement>.parentNode.children, function (htmlElement) {
    return (htmlElement.previousElementSibling === <htmlElement>) ? nextAll = true : nextAll;
});

All Parents

From jQuery

var parents = $(<htmlElement>).parents();

to Vanilla JS

var htmlElement = <htmlElement>,
    parents = [];
while (htmlElement = htmlElement.parentNode) {
    parents.push(htmlElement);
}
parents;

All Previous

From jQuery

$(<htmlElement>).prevAll();

to Vanilla JS

var prevAll = true;
prevAll = [].filter.call(<htmlElement>.parentNode.children, function (htmlElement) {
    return (htmlElement === <htmlElement>) ? prevAll = false : prevAll;
});

Children

From jQuery

$(<htmlElement>).children();

to Vanilla JS

<htmlElement>.children;

Closest Parent

From jQuery

$(<htmlElement>).closest(<parentSelector>);

to Vanilla JS

<htmlElement>.closest(<parentSelector>);

/* // IE fallback
var htmlElement = <htmlElement>,
    parents = [];
while (htmlElement = htmlElement.parentNode) {
    (htmlElement.matches && htmlElement.matches(<parentSelector>)) ? parents.push(htmlElement) : '';
}
parents[0]; */

Find Children

From jQuery

$(<htmlElement>).find(<childrenSelector>);

to Vanilla JS

<htmlElement>.querySelectorAll(<childrenSelector>);

First Child

From jQuery

$(<htmlElement>).children().first();

to Vanilla JS

<htmlElement>.firstChild();

Last Child

From jQuery

$(<htmlElement>).children().last();

to Vanilla JS

<htmlElement>.lastChild();

Matches Selector

From jQuery

$(<htmlElement>).is(<selector>);

to Vanilla JS

<htmlElement>.matches(<selector>);

From jQuery

$(<htmlElement>).next();

to Vanilla JS

<htmlElement>.nextElementSibling; // HTMLElement
// <htmlElement>.nextSibling; // Node

Next Until

From jQuery

$(<htmlElement>).nextUntil(<nextSelector>);

to Vanilla JS

var htmlElement = <htmlElement>,
    nextUntil = [],
    until = true;
while (htmlElement = htmlElement.nextElementSibling) {
    (until && htmlElement && !htmlElement.matches(<nextSelector>)) ? nextUntil.push(htmlElement) : until = false;
}
nextUntil;

Parent

From jQuery

$(<htmlElement>).parent();

to Vanilla JS

<htmlElement>.parentNode;

Parents

From jQuery

var parents = $(<htmlElement>).parents(<parentSelector>);

to Vanilla JS

var htmlElement = <htmlElement>,
    parents = [];
while (htmlElement = htmlElement.parentNode.closest(<parentSelector>)) {
    parents.push(htmlElement);
}
parents;

/* // IE fallback
var htmlElement = <htmlElement>,
    parents = [];
while (htmlElement = htmlElement.parentNode) {
    (htmlElement.matches && htmlElement.matches(<parentSelector>)) ? parents.push(htmlElement) : '';
}
parents; */

Parents Until

From jQuery

var parents = $(<htmlElement>).parentsUntil(<parentSelector>);

to Vanilla JS

var htmlElement = <htmlElement>,
    parentsUntil = [],
    until = true;
while (htmlElement = htmlElement.parentNode.closest(<parentSelector>)) {
    (until) ? parents.push(htmlElement) : until = false;
}
parentsUntil;

/* // IE fallback
var htmlElement = <htmlElement>,
    parentsUntil = [],
    until = true;
while (htmlElement = htmlElement.parentNode) {
    (until && htmlElement.matches && !htmlElement.matches(<parentSelector>)) ? parents.push(htmlElement) : until = false;
}
parentsUntil; */

From jQuery

$(<htmlElement>).prev();

to Vanilla JS

<htmlElement>.previousElementSibling; // HTMLElement
// <htmlElement>.previousSibling // Node;

Previous Until

From jQuery

$(<htmlElement>).prevUntil(<previousSelector>);

to Vanilla JS

var htmlElement = <htmlElement>,
    previousUntil = [],
    until = true;
while (htmlElement = htmlElement.previousElementSibling) {
    (until && htmlElement && !htmlElement.matches(<previousSelector>)) ? previousUntil.push(htmlElement) : until = false;
}
previousUntil;

Siblings

From jQuery

$(<htmlElement>).siblings();

to Vanilla JS

[].filter.call(<htmlElement>.parentNode.children, function (htmlElement) {
    return htmlElement !== <htmlElement>;
});

STYLES

Get Style

From jQuery

$(<htmlElement>).css(<property>);

to Vanilla JS

getComputedStyle(<htmlElement>)[<property>];

Get Scroll Left

From jQuery

$(<htmlElement>).scrollLeft();

to Vanilla JS

<htmlElement>.scrollLeft;

Get Scroll Top

From jQuery

$(<htmlElement>).scrollTop();

to Vanilla JS

<htmlElement>.scrollTop;

Inner Height

From jQuery

$(<htmlElement>).innerHeight();

to Vanilla JS

<htmlElement>.clientHeight

Inner Width

From jQuery

$(<htmlElement>).innerWidth();

to Vanilla JS

<htmlElement>.clientWidth

Offset from Document

From jQuery

$(<htmlElement>).offset();

to Vanilla JS

var rect = <htmlElement>.getBoundingClientRect()
{
    top: rect.top + document.body.scrollTop,
    left: rect.left + document.body.scrollLeft
}

Offset from Parent

From jQuery

$(<htmlElement>).position();

to Vanilla JS

{
    left: <htmlElement>.offsetLeft,
    top: <htmlElement>.offsetTop
}

Offset from Viewport

From jQuery

$(<htmlElement>).offset();

to Vanilla JS

var rect = <htmlElement>.getBoundingClientRect()
{
    top: rect.top + document.body.scrollTop,
    left: rect.left + document.body.scrollLeft
}

Outer Height

From jQuery

$(<htmlElement>).outerHeight();

to Vanilla JS

<htmlElement>.offsetHeight

Outer Width

From jQuery

$(<htmlElement>).outerWidth();

to Vanilla JS

<htmlElement>.offsetWidth

Parent Not Static

From jQuery

$(<htmlElement>).offsetParent();

to Vanilla JS

(<htmlElement>.offsetParent || <htmlElement>)

Set Style

From jQuery

$(<htmlElement>).css(<property>, <value>);

to Vanilla JS

<htmlElement>.style.<property> = <value>;

Set Scroll Left

From jQuery

$(<htmlElement>).scrollLeft(<distance>);

to Vanilla JS

<htmlElement>.scrollLeft = <distance>;

Set Scroll Top

From jQuery

$(<htmlElement>).scrollTop(<distance>);

to Vanilla JS

<htmlElement>.scrollTop = <distance>;

UTILS

Array Each

From jQuery

$.each(<array>, function (i, item) {
    (item === <array>[i]); // true
});

to Vanilla JS

<array>.forEach(function (item, i) {
    (item === <array>[i]); // true
});

Change Futur Context

From jQuery

$.proxy(<fn>, <context>);

to Vanilla JS

<fn>.bind(<context>);

Extend

From jQuery

<object> = $.extend(<extendingObject>, <object>);

to Vanilla JS

<object> = Object.assign(<object>, <extendingObject>);

/* // IE fallback (not deep)
Object.keys(<object>).forEach(function (key) {
    <object>[key] = (<extendingObject>[key]) ? <extendingObject>[key] : <object>[key];
});
<object>; */

Index Of

From jQuery

$.inArray(<item>, <array>);

to Vanilla JS

<array>.indexOf(<item>);

Is Array

From jQuery

$.isArray(<array>);

to Vanilla JS

Array.isArray(<array>);

Map

From jQuery

$.map(<array>, function (item, i) {
    return <operations>;
});

to Vanilla JS

<array>.map(function (item, i) {
    return <operations>;
});

Now

From jQuery

$.now();

to Vanilla JS

Date.now();

Parse HTML

From jQuery

$.parseHTML(<htmlString>);

to Vanilla JS

function parseHTML(htmlString) {
    var body = document.implementation.createHTMLDocument().body;
    body.innerHTML = htmlString;
    return body.childNodes;
}

parseHTML(<htmlString>);

Parse JSON

From jQuery

$.parseJSON(<jsonString>);

to Vanilla JS

JSON.parse(<jsonString>);

Parse XML

From jQuery

$.parseXML(<xmlString>);

to Vanilla JS

function parseXML(xmlString) {
    return (new DOMParser()).parseFromString(xmlString, 'text/xml');
}

parseXML(<xmlString>);

Serialize Array

From jQuery

$.serializeArray(<form>);

to Vanilla JS

function serializeArray(form) {
    var field, length, output = [];

    if (typeof form === 'object' && form.nodeName === 'FORM') {
        var length = form.elements.length;
        for (i = 0; i < length; i++) {
            field = form.elements[i];
            if (field.name && !field.disabled && field.type !== 'file' && field.type != 'reset' && field.type != 'submit' && field.type != 'button') {
                if (field.type === 'select-multiple') {
                    length = form.elements[i].options.length;
                    for (j = 0; j < length; j++) {
                        if(field.options[j].selected)
                            output[output.length] = { name: field.name, value: field.options[j].value };
                    }
                } else if ((field.type !== 'checkbox' && field.type !== 'radio') || field.checked) {
                    output[output.length] = { name: field.name, value: field.value };
                }
            }
        }
    }

    return output;
}
serializeArray(<form>);

Serialize String

From jQuery

$.serialize(<form>);

to Vanilla JS

function serialize(form) {
    var field, length, output = [];

    if (typeof form === 'object' && form.nodeName === 'FORM') {
        var length = form.elements.length;
        for (var i = 0; i < length; i++) {
            field = form.elements[i];
            if (field.name && !field.disabled && field.type !== 'file' && field.type !== 'reset' && field.type !== 'submit' && field.type !== 'button') {
                if (field.type === 'select-multiple') {
                    length = form.elements[i].options.length;
                    for (var j=0; j < length; j++) {
                        if (field.options[j].selected) {
                            output[output.length] = encodeURIComponent(field.name) + '=' + encodeURIComponent(field.options[j].value);
                        }
                    }
                } else if ((field.type !== 'checkbox' && field.type !== 'radio') || field.checked) {
                    output[output.length] = encodeURIComponent(field.name) + '=' + encodeURIComponent(field.value);
                }
            }
        }
    }

    return output.join('&').replace(/%20/g, '+');
}
serialize(<form>);

Trim

From jQuery

$.trim(<string>);

to Vanilla JS

<string>.trim();

Vanilla JS

Overview

Use in Development

Use in Production

Summary

Speed Comparison

Retrieve DOM element by ID

Retrieve 10 DOM elements by tag name

Vanilla JS vs jQuery

Retrieve 10 DOM elements by class name

Retrieve DOM element with <#id> .inner span selector

Retrieve 10 DOM elements with <.className> .inner span selector

Vanilla JS Selector Performances

From jQuery to Vanilla JS

.Node #Selector

#id

.classname #id tagname

[.classname #id tagname]

[.classname]

[name]

[tagname]

Reverted Loop

AJAX

GET

JSON

POST

Request / Response

ATTRIBUTES

Add Class

Get Attribute

Get Data

Get Value

Has Class

Remove Attribute

Remove Class

Remove Data

Set Attribute

Set Data

Set Value

Toggle Class

EFFECTS

Animation

Hide

Show

EVENTS

Hover

Load

Off

On

One

Ready

Trigger

FILTERS

Filter

First

Has

Is

Item

Last

Not

Slice

MANIPULATION

Append

Clone

Compare

Contains

Create

Empty

Get HTML

Get Node HTML

Get Text

Index From Parent

Insert After

Insert Before

Prepend

Remove

Remove Children

Replace

Set HTML

Set Node HTML

Retrieve DOM element with `<#id> .inner span` selector

Retrieve 10 DOM elements with `<.className> .inner span` selector