random() // random number between 0 and 1 Math. max( 0, 3, - 2, 2) // = 3 - the highest value Math. abs( - 3.14) // = 3.14 - absolute, positive value Math. pow( 2, 8) // = 256 - 2 to the power of 8 Math. MIN_VALUE // smallest possible JS number Number. MAX_VALUE // largest possible JS number Number.
valueOf() // returns number Number( true) // converts to number Number( new Date()) // number of milliseconds since 1970 parseInt( "3 months") // returns the first number: 3 parseFloat( "3.5 days") // returns 3.5 Number. Pi.toFixed( 2) // returns 3.14 - for working with money Transitionend, onmessage, onmousewheel, ononline, onoffline, onpopstate, onshow, onstorage, ontoggle, onwheel, ontouchcancel, ontouchend, ontouchmove, ontouchstart Onabort, oncanplay, oncanplaythrough, ondurationchange, onended, onerror, onloadeddata, onloadedmetadata, onloadstart, onpause, onplay, onplaying, onprogress, onratechange, onseeked, onseeking, onstalled, onsuspend, ontimeupdate, onvolumechange, onwaitingĪnimationend, animationiteration, animationstart Ondrag, ondragend, ondragenter, ondragleave, ondragover, ondragstart, ondrop Onblur, onchange, onfocus, onfocusin, onfocusout, oninput, oninvalid, onreset, onsearch, onselect, onsubmit Onabort, onbeforeunload, onerror, onhashchange, onload, onpageshow, onpagehide, onresize, onscroll, onunload
Mouse onclick, oncontextmenu, ondblclick, onmousedown, onmouseenter, onmouseleave, onmousemove, onmouseover, onmouseout, onmouseup Person // member !(a = b) // logical notĪ ! = b // not equal typeof a // type (number, object, function.)Ī + = b // a = a + b (works with - * %.) 100 / 48 remainder = 4Ī ++ b - // postfix increment and decrement Bitwise operators & X = 1 // Throws an error because variable is not declared Values false, true // boolean 18, 3.14, 0b10011, 0xF6, NaN // number "flower", 'John' // string undefined, null, Infinity // special Operators a = b + c - d // addition, substractionĪ = b * (c / d) // multiplication, division
Cheatsheet code#
Let z = 'zzz' // block scope local variable Strict mode "use strict" // Use strict mode to write secure code
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