Moves part of array within. :package: :smiley_cat: :running: :vhs: :moon: :scroll: :newspaper: :blue_book:

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

This is part of package extra-array.

array.moveWithin$(x, [j], [i], [I]);
// x: an array (updated)
// j: write index (0)
// i: read start index (0)
// I: read end index (X)
// → x

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

var x = [1, 2, 3, 4, 5, 6];
array.moveWithin$(x, 0, 1, 3);
// [ 2, 3, 1, 4, 5, 6 ] (2,3 to left)

x;
// [ 2, 3, 1, 4, 5, 6 ]

var x = [1, 2, 3, 4, 5, 6];
array.moveWithin$(x, 6, 3, 5);
// [ 1, 2, 3, 6, 4, 5 ] (4,5 to right)

References

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