What is `delete()`?

Question

When I use delete keyword as a function it returns boolean and if I pass anything it doesn't throw error

const foo = 0
delete(foo) // false

const bar = 1
delete(bar) // false

delete(unknown) // true

delete(5) // true

I don't understand this behaviour so I wanna someone to explain to me why javascript works like that

You're not using it "as a function". You just use the `delete` operator on a parenthesised expression. Notice you get exactly the same results with `delete foo`, `delete bar`, `delete unknown` and `delete 5`. — Bergi, Nov 12 '21 at 00:06

score 1 · Answer 1 · answered Nov 11 '21 at 23:13

The return value is:

true for all cases except when the property is an own non-configurable property, in which case, false is returned in non-strict mode.

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