constructor.js - mozsearch

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/* Any copyright is dedicated to the Public Domain.

 * http://creativecommons.org/licenses/publicdomain/ */

// Symbol(symbol) throws a TypeError.

var sym = Symbol();

assertThrowsInstanceOf(() => Symbol(sym), TypeError);

// Symbol(undefined) is equivalent to Symbol().

assertEq(Symbol(undefined).toString(), "Symbol()");

// Otherwise, Symbol(v) means Symbol(ToString(v)).

assertEq(Symbol(7).toString(), "Symbol(7)");

assertEq(Symbol(true).toString(), "Symbol(true)");

assertEq(Symbol(null).toString(), "Symbol(null)");

assertEq(Symbol([1, 2]).toString(), "Symbol(1,2)");

var symobj = Object(sym);

assertThrowsInstanceOf(() => Symbol(symobj), TypeError);

var hits = 0;

var obj = {

    toString: function () {

        hits++;

        return "ponies";

};

assertEq(Symbol(obj).toString(), "Symbol(ponies)");

assertEq(hits, 1);

assertEq(Object.getPrototypeOf(Symbol.prototype), Object.prototype);

// Symbol.prototype is not itself a Symbol object.

assertThrowsInstanceOf(() => Symbol.prototype.valueOf(), TypeError);

if (typeof reportCompare === "function")

    reportCompare(0, 0);