copyWithin

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 (end)

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

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