unshift (original) (raw)

Add values to the start.

Alternatives: unshift, unshift$.
Similar: push, pop, shift, unshift.

function unshift(x, ...vs) // x: an array // vs: values to add

const xarray = require('extra-array');

var x = [3, 4]; xarray.unshift(x, 2); // → [ 2, 3, 4 ]

xarray.unshift(x, 1, 2); // → [ 1, 2, 3, 4 ]

References

• Array.unshift() : MDN Web Docs
• array_unshift() : PHP
• Array.unshift() : Ruby
• immutable-iterable-prototype : @azu