Diffusion Ant (master) Code

ant/examples/spec/symbols.js
8755416ca476master

symbols.js
View Options

			import { test, summary } from './helpers.js';

			console.log('Symbol Tests\n');

			const sym1 = Symbol('test');
			test('symbol typeof', typeof sym1, 'symbol');

			const sym2 = Symbol('test');
			test('symbols are unique', sym1 !== sym2, true);

			test('symbol description', sym1.description, 'test');

			const sym3 = Symbol();
			test('symbol without description', sym3.description, undefined);

			const obj = {};
			const symKey = Symbol('key');
			obj[symKey] = 'value';
			test('symbol as key', obj[symKey], 'value');

			const symFor1 = Symbol.for('shared');
			const symFor2 = Symbol.for('shared');
			test('Symbol.for same', symFor1 === symFor2, true);

			test('Symbol.keyFor', Symbol.keyFor(symFor1), 'shared');
			test('Symbol.keyFor local', Symbol.keyFor(sym1), undefined);

			test('Symbol.iterator exists', typeof Symbol.iterator, 'symbol');
			test('Symbol.toStringTag exists', typeof Symbol.toStringTag, 'symbol');
			test('Symbol.hasInstance exists', typeof Symbol.hasInstance, 'symbol');

			const custom = { [Symbol.toStringTag]: 'MyCustomType' };
			test('Symbol.toStringTag custom', Object.prototype.toString.call(custom), '[object MyCustomType]');

			summary();

Owner Packages

No Owners