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 start index [0]
// I: read end index [|x|]

const array = require('extra-array');

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

x;
// → [ 10, 20, 30, 4, 5 ]

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

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

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

References

• Array.prototype.copyWithin: MDN web docs
• Collections.copy: Java