JavaScript Feature Compatibility


MongoDB Realm functions fully support JavaScript ES5 syntax as well as most modern JavaScript features included in EcmaScript 2015 (ES6) and more recent releases. This page outlines Realm’s support for a non-exhaustive list of features released in or since EcmaScript 2015.

Built-In Objects

Feature Supported
TypedArray Yes
Map Yes
Set Yes
WeakMap Yes
WeakSet No
Proxy No
Reflect No
Promise Yes
Symbol Yes
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