Sets value at index.
Alternatives: set, set$, setPath$.
Similar: get, set, remove.
This is part of package extra-array.
array.set(x, i, v);
// x: an array
// i: index
// v: valueconst array = require("extra-array");
var x = [2, 4, 6, 8];
array.set(x, 1, 40);
// [ 2, 40, 6, 8 ]
array.set(x, 3, 80);
// [ 2, 4, 6, 80 ]