What Every JavaScript Developer Should Know About ECMAScript 2015 (OdeToCode Programming Series) by K. Scott Allen

Author:K. Scott Allen [Allen, K. Scott]
Language: eng
Format: epub
Publisher: OdeToCode LLC
Published: 2015-11-20T18:30:00+00:00

expect(Object.getOwnPropertySymbols(person)).toEqual([firstName]);

let symbol0 = Object.getOwnPropertySymbols(person)[0];

expect(person[symbol0]).toBe("Scott");

Now that we know more about symbols, let’s see how symbols relate to iterable objects.

Iterables and Symbols

The ES2015 specification defines several well-known symbols. The JavaScript runtime environment uses well-known symbols in the algorithms described by the specification, and each well-known symbol is a property on theSymbol function itself.

One such well-known symbol isSymbol.iterator. If we can access theSymbol.iterator member of an object, the member should be a method we can use to obtain an iterator. The following code will check to see if strings, arrays, and numbers are iterable by looking for this well-known iterator symbol.

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