Is there a dictionary implementation in JavaScript?

Question

How can I implement an array with an indexer in JavaScript? Is there something like a dictionary in .Net?

Answer 1

ECMAScript 6 (aka the 2015 JavaScript spec), specifies a dictionary interface, named Map. It supports arbitrary keys of any type, has a read-only size property, is not cluttered with prototypes related stuff like objects, and can be iterated over using the new for...of... construct or Map.forEach. Check the documentation on the MDN here, and the browser compatibility table here.