javascript object property name as decimal notation

Question

This is a more specific to this question, which only goes as far as discussing keys as numeric whole integers.

In regards to 'numeric or string literal for the name of a property', I've tried this in the Chrome console var obj = { 2.15: 'foo' } console.log(obj[2.15]) and it works. I would not assume it standard across all browsers, especially older ones. However such a key notation as part of a default configuration provided by my users could be useful. I think using Map, though within standards ('Any value (both objects and primitive values) may be used as either a key or a value'), could be intimidating. If it works, why should it not be used?

Both lines implicitly convert the number to a string. typeof Object.keys(obj)[0] === "string" — JJJ
– JJJ, Commented May 4, 2017 at 9:13
You can access it using obj["2.15"], it's supposed to be supported by all browsers — Vivick
– Vivick, Commented May 4, 2017 at 9:20
@torazaburo Do you know where I might find the official specification to whether or not I can use decimal fraction? — garajo
– garajo, Commented May 4, 2017 at 9:24
@Vivick I know I can use the string form, but it looks awkward — garajo
– garajo, Commented May 4, 2017 at 9:26

Quentin · Accepted Answer · 2017-05-04 09:23:06Z

2

The specification says:

PropertyName :
  IdentifierName
  StringLiteral
  NumericLiteral

and shows that floats are fine in a NumericLiteral.

It's standard. Use it if you want to.

answered May 4, 2017 at 9:23

Quentin

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