why does Object.keys(array) return the indexes as a string, and keys(array) returns them as numbers?

Question

for example:

greetings = ['hey','hi','hello']

Object.keys(greetings) // ["0", "1", "2"]

BUT

keys(greetings) // [0, 1, 2]

@VLAZ it seems to be doing the same thing, i tried it on the console... just a function that gives u keys in an object. — jayykaa
– jayykaa, Commented Jul 30, 2021 at 18:39
@jayykaa we prefer to not go by "seems like" but something more actionable. I can give you the reference for Object.keys but not for keys. If it's non-standard, we probably shouldn't be guessing what it does. — VLAZ
– VLAZ, Commented Jul 30, 2021 at 18:40
Question I have is why would you want to use Object.keys on an array in the first place — epascarello
– epascarello, Commented Jul 30, 2021 at 18:47

Kelvin Schoofs · Accepted Answer · 2021-07-30 18:38:24Z

1

You are trying the command line API's keys, which isn't actually part of standard JavaScript. It's something Chromium-based browsers inject in DevTools.

As for why it returns different results, not sure. On the other hand, in JavaScript, indexing with a number is identical to indexing with the string version of that number, so it doesn't really matter.

answered Jul 30, 2021 at 18:38

Kelvin Schoofs

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3 Comments

VLAZ Over a year ago

On FF keys(["a", "b", "c"]) returns [ "0", "1", "2" ]

jayykaa Over a year ago

i dont know enough about this, so if u get votes ill market it as the answer! thanks

Kelvin Schoofs Over a year ago

For me it returns a number array. Since it isn't actually part of any JS specification, it actually doesn't matter how it behaves. Regular JavaScript (in <script> tags etc) shouldn't be able to even access that function.

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