reduce - nodef/extra-lists GitHub Wiki
Reduce values of entries to a single value.
function reduce(x, fr, acc?)
// x: lists
// fr: reduce function (acc, v, k, x)
// acc: initial value
const xlists = require('extra-lists');
var x = ['a', 'b', 'c', 'd'], [1, 2, 3, 4](/nodef/extra-lists/wiki/'a',-'b',-'c',-'d'],-[1,-2,-3,-4);
xlists.reduce(x, (acc, v) => acc+v);
// → 10
xlists.reduce(x, (acc, v) => acc+v, 100);
// → 110