ladybird/Libraries/LibJS/Tests/function-rest-params.js

load("test-common.js");

try {
    function foo(...a) {
        assert(a instanceof Array);
        assert(a.length === 0);
    }
    foo();

    function foo(...a) {
        assert(a instanceof Array);
        assert(a.length === 4);
        assert(a[0] === "foo");
        assert(a[1] === 123);
        assert(a[2] === undefined);
        assert(a[3].foo === "bar");
    }
    foo("foo", 123, undefined, { foo: "bar" });

    function foo(a, b, ...c) {
        assert(a === "foo");
        assert(b === 123);
        assert(c instanceof Array);
        assert(c.length === 0);
    }
    foo("foo", 123);

    function foo(a, b, ...c) {
        assert(a === "foo");
        assert(b === 123);
        assert(c instanceof Array);
        assert(c.length === 2);
        assert(c[0] === undefined);
        assert(c[1].foo === "bar");
    }
    foo("foo", 123, undefined, { foo: "bar" });

    var foo = (...a) => {
        assert(a instanceof Array);
        assert(a.length === 0);
    };
    foo();

    var foo = (a, b, ...c) => {
        assert(a === "foo");
        assert(b === 123);
        assert(c instanceof Array);
        assert(c.length === 2);
        assert(c[0] === undefined);
        assert(c[1].foo === "bar");
    };
    foo("foo", 123, undefined, { foo: "bar" });

    console.log("PASS");
} catch (e) {
    console.log("FAIL: " + e);
}