rc-js-util/src/map/impl/map-push.spec.ts

A collection of TS and C++ utilities to help writing performant and correct applications, achieved through strict typing and (removable) invariant checking.

import { mapPush } from "./map-push.js";

describe("=> mapPush", () =>
{
    const values = new Map([["a", [1]]]);

    it("| pushes where array exists", () =>
    {
        mapPush(values, "a", 2);
        expect(values.get("a")).toEqual([1, 2]);
    });

    it("| creates array where key not defined", () =>
    {
        mapPush(values, "b", 3);
        expect(values.get("b")).toEqual([3]);
    });
});