@extra-array/set-path-update/index.js

Sets value at path in a nested array.

'use strict';
function is(v) {
    return Array.isArray(v);
}
function index(x, i = 0) {
    return i < 0 ? Math.max(x.length + i, 0) : Math.min(i, x.length);
}
function set$(x, i, v) {
    x[index(x, i)] = v;
    return x;
}
function last(x, vd) {
    return x.length > 0 ? x[x.length - 1] : vd;
}
function getPath(x, p) {
    for (var i of p)
        x = is(x) ? x[i] : undefined;
    return x;
}
function setPath$(x, p, v) {
    var y = getPath(x, p.slice(0, -1));
    if (is(y))
        set$(y, last(p), v);
    return x;
}
module.exports = setPath$;