for.js - mozsearch

Enable keyboard shortcuts

/* Any copyright is dedicated to the Public Domain.

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

// Symbol.for called twice with the same argument returns the same symbol.

assertEq(Symbol.for("ponies"), Symbol.for("ponies"));

// Called twice with equal strings: still the same result.

var one = Array(64+1).join("x");

var two = Array(8+1).join(Array(8+1).join("x"));

assertEq(Symbol.for(one), Symbol.for(two));

// Symbols created by calling Symbol() are not in the symbol registry.

var sym = Symbol("123");

assertEq(Symbol.for("123") !== sym, true);

// Empty string is fine.

assertEq(typeof Symbol.for(""), "symbol");

// Primitive arguments.

assertEq(Symbol.for(3), Symbol.for("3"));

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

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

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

// Symbol.for ignores the 'this' value.

var foo = Symbol.for("foo")

assertEq(Symbol.for.call(String, "foo"), foo);

assertEq(Symbol.for.call(3.14, "foo"), foo);

if (typeof reportCompare === "function")

    reportCompare(0, 0);