Function keys

  • Creates an array of the own enumerable property names of object.

    Note: Non-object values are coerced to objects. See the ES spec for more details.

    Parameters

    • object: object

      The object to query.

    Returns string[]

    Returns the array of property names.

    Since

    5.5.0

    See

    [[values]], [[valuesIn]]

    Example

    function Foo() {
    this.a = 1
    this.b = 2
    }

    Foo.prototype.c = 3

    keys(new Foo)
    // => ['a', 'b'] (iteration order is not guaranteed)

    keys('hi')
    // => ['0', '1']
  • Parameters

    • object: ArrayLike<any>

    Returns string[]