geninq/src/functions/zip.test.ts

A JavaScript version of the Linq library for Generators

import "./zip";
import "./array";
import { It, ItThrows } from "../test-utils";

It("Combined two sequences automatically", (s) => s.zip([3, 2, 1]).array(), [
  [1, 3],
  [2, 2],
  [3, 1],
]);
It(
  "Combined two sequences on a selector",
  (s) => s.zip([3, 2, 1], (a, b) => ({ original: a, incoming: b })).array(),
  [
    { original: 1, incoming: 3 },
    { original: 2, incoming: 2 },
    { original: 3, incoming: 1 },
  ]
);
ItThrows(
  "Errors if the sequences are different lengths",
  (s) => s.zip([1, 2, 3, 4]).array(),
  new Error("Sequences are unequal in length")
);