moveWithin$

Move part of array within!

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

function moveWithin$(x, j, i, I)
// x: an array (updated!)
// 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, 6];
xarray.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];
xarray.moveWithin$(x, 6, 3, 5);
// → [ 1, 2, 3, 6, 4, 5 ] (4,5 to right)

References

• Array.copyWithin() : MDN Web Docs
• immutable-iterable-prototype : @azu
• array-move : @sindresorhus