Userland/Libraries/LibJS/Tests/operators/logical-nullish-coalescing.js


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test("booleans", () => {
    expect(true ?? true).toBeTrue();
    expect(false ?? false).toBeFalse();
    expect(true ?? false).toBeTrue();
    expect(false ?? true).toBeFalse();
});

test("strings", () => {
    expect("" ?? "").toBe("");
    expect("" ?? false).toBe("");
    expect("" ?? true).toBe("");
    expect(false ?? "").toBeFalse();
    expect(true ?? "").toBeTrue();
    expect("foo" ?? "bar").toBe("foo");
    expect("foo" ?? false).toBe("foo");
    expect("foo" ?? true).toBe("foo");
    expect(false ?? "bar").toBeFalse();
    expect(true ?? "bar").toBeTrue();
});

test("numbers", () => {
    expect(false ?? 1 === 2).toBeFalse();
    expect(true ?? 1 === 2).toBeTrue();
    expect(0 ?? false).toBe(0);
    expect(0 ?? true).toBe(0);
    expect(42 ?? false).toBe(42);
    expect(42 ?? true).toBe(42);
    expect(false ?? 0).toBeFalse();
    expect(true ?? 0).toBeTrue();
    expect(false ?? 42).toBeFalse();
    expect(true ?? 42).toBeTrue();
});

test("objects", () => {
    expect([] ?? false).toHaveLength(0);
    expect([] ?? true).toHaveLength(0);
    expect(false ?? []).toBeFalse();
    expect(true ?? []).toBeTrue();
});

test("null & undefined", () => {
    expect(null ?? false).toBeFalse();
    expect(null ?? true).toBeTrue();
    expect(false ?? null).toBeFalse();
    expect(true ?? null).toBeTrue();
    expect(undefined ?? false).toBeFalse();
    expect(undefined ?? true).toBeTrue();
    expect(false ?? undefined).toBeFalse();
    expect(true ?? undefined).toBeTrue();
});