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Bug 238121

Summary:	Highlight NaN, Infinity and undefined
Product:	javascript	Reporter:	peterkehl <peterkehl>
Component:	Editor	Assignee:	Reema
Status:	NEW ---
Severity:	normal
Priority:	P3
Version:	7.4
Hardware:	PC
OS:	Linux
Issue Type:	ENHANCEMENT	Exception Reporter:

Description peterkehl 2013-11-08 04:20:50 UTC

Since ECMAScript 5 (i.e. Firefox 4 and newer), NaN, Infinity and undefined are non-writable global objects. So, effectively they act like keywords or literals (even though they are not).

Please, would you consider highlighting them blue like a keyword, or green like a field, or in some other way distinguishing them from standard variables/symbols.

See https://developer.mozilla.org/en-US/docs/Web/JavaScript/New_in_JavaScript/1.8.5: The NaN, Infinity, and undefined global objects have been made read only, per the ECMAScript 5 specification.