@extra-array/partition-as/index.js

Segregates values by similarity.

'use strict';
function id(v) {
    return v;
}
function partitionAs(x, fm = null) {
    var fm = fm || id;
    var a = new Map(), i = -1;
    for (var v of x) {
        var v1 = fm(v, ++i, x);
        if (!a.has(v1))
            a.set(v1, []);
        a.get(v1).push(v);
    }
    return a;
}
module.exports = partitionAs;