ladybird/Libraries/LibJS/Tests/to-number-basic.js

try {
    assert(+false === 0);
    assert(-false === 0);
    assert(+true === 1);
    assert(-true === -1);
    assert(+null === 0);
    assert(-null === 0);
    assert(+[] === 0);
    assert(-[] === 0);
    assert(+[[[[[]]]]] === 0);
    assert(-[[[[[]]]]] === 0);
    assert(+[[[[[42]]]]] === 42);
    assert(-[[[[[42]]]]] === -42);
    assert(+"" === 0);
    assert(-"" === 0);
    assert(+"42" === 42);
    assert(-"42" === -42);
    assert(+42 === 42);
    assert(-42 === -42);
    assert(+1.23 === 1.23);
    assert(-1.23 === -1.23);
    // FIXME: returns NaN
    // assert(+"1.23" === 1.23)
    // assert(-"1.23" === -1.23)

    assert(isNaN(+undefined));
    assert(isNaN(-undefined));
    assert(isNaN(+{}));
    assert(isNaN(-{}));
    assert(isNaN(+{a: 1}));
    assert(isNaN(-{a: 1}));
    assert(isNaN(+[1, 2, 3]));
    assert(isNaN(-[1, 2, 3]));
    assert(isNaN(+[[[["foo"]]]]));
    assert(isNaN(-[[[["foo"]]]]));
    assert(isNaN(+"foo"));
    assert(isNaN(-"foo"));

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