unshift

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wolfram77 edited this page Mar 27, 2020 · 21 revisions

Adds values to the start.

Similar: push, pop, shift, unshift.

iterable.unshift(x, ...vs);
// x:  an iterable
// vs: values to add
// --> iterable

const iterable = require('extra-iterable');

var x = [3, 4].values();
[...iterable.unshift(x, 2)];
// [ 2, 3, 4 ]

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

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