cheatsheets/js-lazy.md

title	category	layout
JavaScript lazy shortcuts	JavaScript	2017/sheet

Shortcuts

{: .-left-reference}

Examples

n = +'4096'    // n === 4096
s = '' + 200   // s === '200'

now = +new Date()
isPublished = !!post.publishedAt

Shortcuts

What	Lazy mode	"The right way"
String to number	+str	parseInt(str, 10) or parseFloat()
Math floor	`num	0`
Number to string	'' + num	num.toString()
Date to UNIX timestamp	+new Date()	new Date().getTime()
Any to boolean	!!value	Boolean(value)
Check array contents	if (~arr.indexOf(v))	if (arr.includes(v))
{: .-left-align.-headers}

.includes is ES6-only, otherwise use .indexOf(val) !== -1 if you don't polyfill.