copyWithin

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wolfram77 edited this page Mar 27, 2020 · 26 revisions

Copies part of iterable within.

Similar: within, another.

iterable.copyWithin(x, j, [i], [I]);
// x: an iterable
// j: write index
// i: read start index (0)
// I: read end index   (x.length)

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

var x = [1, 2, 3, 4, 5];
[...iterable.copyWithin(x, 3)];
// [1, 2, 3, 1, 2]

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

[...iterable.copyWithin(x, 3, 1, 2)];
// [1, 2, 3, 2, 5]

references