Function inspect

inspect<T>(inspector: (t: T) => void): (t: T) => T

Inspects the passing value with an inspector. It is useful for using some side effects.

Type Parameters

T

Parameters

inspector: (t: T) => void
An inspector to see the passing value.

Returns (t: T) => T

An identity function.

Examples

Example

const result = cat(-3)
    .feed(inspect((x) => expect(x).toStrictEqual(-3)))
    .feed((x) => x ** 2)
    .feed(inspect((x) => expect(x).toStrictEqual(9)))
    .feed((x) => x.toString())
    .feed(inspect((x) => expect(x).toStrictEqual("9")));
expect(result.value).toStrictEqual("9");