Valid JavaScript variable names in ES5 · Mathias Bynens
Note: This article is based on the ECMAScript 5 specification. For the updated ES2015 version, see Valid JavaScript variable names in ES2015. Did you know var π = Math.PI; is syntactically valid JavaScript? I thought this was pretty cool, so I decided to look into which Unicode glyphs are allowed in JavaScript variable names, or identifiers as the ECMAScript specification calls them. Reserved word
JavaScript variable name validator
Wondering if you can use a given string as a variable name in JavaScript? Learn how it works, or just use this tool. permalink Enter a variable name: That’s a valid identifier according to ECMAScript 6 / Unicode 8.0.0. However, the NaN, Infinity, and undefined properties of the global object are immutable or read-only. Setting them won’t have an effect. Avoid using this variable name. It is a rese
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