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Adds values to the start.
Alternatives: default, update. Similar: push, pop, shift, unshift.
array.unshift(x, ...vs); // x: an array // vs: values to add // --> array
const array = require('extra-array'); var x = [3, 4]; array.unshift(x, 2); // [ 2, 3, 4 ] array.unshift(x, 1, 2); // [ 1, 2, 3, 4 ]