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Set value at index!
Alternatives: set, set$, setPath$. Similar: get, set, remove.
function set$(x, i, v) // x: an array (updated!) // i: index // v: value
const xarray = require('extra-array'); var x = [2, 4, 6, 8]; xarray.set$(x, 1, 40); // → [ 2, 40, 6, 8 ] x; // → [ 2, 40, 6, 8 ] var x = [2, 4, 6, 8]; xarray.set$(x, 3, 80); // → [ 2, 4, 6, 80 ]