copyWithin (original) (raw)
Copy part of array within.
Alternatives: copyWithin, copyWithin$.
Similar: copy, copyWithin, moveWithin.
function copyWithin(x, j, i, I) // x: an array // j: write index [0] // i: read begin index [0] // I: read end index [|x|]
const xarray = require('extra-array');
var x = [1, 2, 3, 4, 5]; xarray.copyWithin(x, 3); // → [ 1, 2, 3, 1, 2 ]
xarray.copyWithin(x, 3, 1); // → [ 1, 2, 3, 2, 3 ]
xarray.copyWithin(x, 3, 1, 2); // → [ 1, 2, 3, 2, 5 ]