copyWithin - nodef/extra-iterable GitHub Wiki
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]