Function once

Creates a function that is restricted to invoking func once. Repeat calls to the function return the value of the first invocation. The func is invoked with the arguments of the created function.

Returns

Returns the new restricted function.

Example

let func = x => x
let single = once(func)
single(1) // 1
single(2) // 1
single(3) // 1
// ...
// `func` is invoked only once.