rauschma

This content moved here: https://exploringjs.com/impatient-js/ch_arrays.html#quickref-arrays

thegitfather

Vanilla JavaScript Quick Reference / Cheatsheet

Just migrated it from Codepen.io to markdown. Credit goes to David Conner.

Working with DOM	Working with JS	Working With Functions
Accessing Dom Elements	Add/Remove Array Item	Add Default Arguments to Function
Grab Children/Parent Node(s)	Add/Remove Object Properties	Throttle/Debounce Functions
Create DOM Elements	Conditionals

paulirish

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

terkel

// _decimal.scss | MIT License | gist.github.com/terkel/4373420

// Round a number to specified digits.
//
// @param  {Number} $number A number to round
// @param  {Number} [$digits:0] Digits to output
// @param  {String} [$mode:round] (round|ceil|floor) How to round a number
// @return {Number} A rounded number
// @example
//     decimal-round(0.333)    => 0