ECMAScript

ECMAScript is the standardization of the family of scripting languages that includes JavaScript. New versions of the standard are released every year.

The "!" is shown in the section below:

`When Boolean is called with argument value, the following steps are taken:

Let b be ! ToBoolean(value).

If NewTarget is undefined, return b.

Let O be ? OrdinaryCreateFromConstructor(NewTarget, "%BooleanPrototype%", « [[BooleanData]] »).

Set O.[[BooleanData]] to b.

Return O.`

ECMAScript

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tc39 / ecma262

FrontendMasters / javascript-enlightenment

tc39 / proposal-cancellation

TimothyGu / es-howto

extraneous "!" in the text?

tc39 / proposal-regexp-unicode-property-escapes

tc39 / proposal-array-find-from-last

tc39 / proposal-class-static-block

yanhaijing / es5

ecmascript-daily / ecmascript-daily.github.com

wx-chevalier / JavaScript-Series

tc39 / proposal-number-fromstring

tc39 / proposal-private-fields-in-in

tc39 / proposal-standardized-debug

YauhenKavalchuk / es6

tc39 / proposal-get-intrinsic

devsnek / proposal-symbol-thenable

SeonHyungJo / FrontEnd-Note

Kingwl / proposal-string-trim-characters

exiguus / js.device.selector

mumuy / tools-library

browserkids / web-components

TrueMoein / frontend-sessions

taylor-edwards / arcade

rubengees / vue-workshop

ArchitectAK / ES6

alanabarbosa / MenuJavascript

Wetbikeboy2500 / ScriftJ

weltonfelix / Js-ES_CEV

anmol1512 / Digital-Clock

Bhargav-2808 / Ecma-script