copyWithin

Copy part of iterable within.

Alternatives: copy, copyWithin.
Similar: copy, fill.

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

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

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

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

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

References

• Array.prototype.copyWithin: MDN web docs
• immutable-prototype: @azu