copy$

Copy part of array to another!

Alternatives: copy, copy$.
Similar: copy, copyWithin, moveWithin.

function copy$(x, y, j, i, I)
// x: target array (updated!)
// y: source 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];
var y = [10, 20, 30];
xarray.copy$(x, y);
// → [ 10, 20, 30, 4, 5 ]

x;
// → [ 10, 20, 30, 4, 5 ]

var x = [1, 2, 3, 4, 5];
xarray.copy$(x, y, 1);
// → [ 1, 10, 20, 30, 5 ]

var x = [1, 2, 3, 4, 5];
xarray.copy$(x, y, 1, 1);
// → [ 1, 20, 30, 4, 5 ]

var x = [1, 2, 3, 4, 5];
xarray.copy$(x, y, 1, 1, 2);
// → [ 1, 20, 3, 4, 5 ]

References

• Array.copyWithin() : MDN Web Docs
• Collections.copy() : Java