unshift

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Subhajit Sahu edited this page May 3, 2023 · 22 revisions

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