keys() function

Returns an iterator of keys.

Supports plain objects, Map, and Set: - For objects: returns own enumerable string keyed property names - For Map: returns keys - For Set: returns values (Set keys are the same as values)

Signature:

declare function keys<T extends Map<any, any> | Set<any> | Record<Key, any>>(obj: T): KeysResult<T>;

Example

[...keys({ a: 1, b: "2", c: true })]
// ["a", "b", "c"]

[...keys(new Map([["a", 1], ["b", 2]]))]
// ["a", "b"]

[...keys(new Set([1, 2, 3]))]
// [1, 2, 3]

Open Source Code