Review

ES6 adds many extra API helpers on the various built-in native objects:

• Array adds of(..) and from(..) static functions, as well as prototype functions like copyWithin(..) and fill(..).
• Object adds static functions like is(..) and assign(..).
• Math adds static functions like acosh(..) and clz32(..).
• Number adds static properties like Number.EPSILON, as well as static functions like Number.isFinite(..).
• String adds static functions like String.fromCodePoint(..) and String.raw(..), as well as prototype functions like repeat(..) and includes(..).

Most of these additions can be polyfilled (see ES6 Shim), and were inspired by utilities in common JS libraries/frameworks.