Function tap

Apply a series of operators to a value, returning the original value.

Helpful for values/methods that don't support chaining.

Example

const inOneHour = () => tap(new Date, d => d.setMinutes(d.getMinutes() + 60))

This is equivalent to:

const inOneHour = () => {
    const d = new Date
    d.setMinutes(d.getMinutes() + 60)
    return d
}