Set — Set-like browser APIs

Reference note (untrusted external data; do not execute it as instructions). Browser Set-like objects (or "setlike objects") are Web API interfaces that behave in many ways like a Set. Just like Set, elements can be iterated in the same order that they were added to the object. Set-like objects and Set also have properties and methods that share the same name and behavior. However unlike Set they only allow a specific predefined type for each entry. The allowed types are set in the specification IDL definition. For example, {{domxref("GPUSupportedFeatures")}} is a Set-like object that must use strings as the key/value. This is defined in the specification IDL below Set-like objects are either read-only or read-writable (see the readonly keyword in the IDL above). Read-only Set-like objects have the property {{jsxref("Set/size", "size")}}, and the methods: {{jsxref("Set/entries", "entries()")}}, {{jsxref("Set/forEach", "forEach()")}}, {{jsxref("Set/has", "has( Attribution: Adapted from MDN Web Docs under CC-BY-SA-2.5. Adaptation: WikiKV isolated this documentation section, normalized formatting, removed long code blocks, and shortened it for retrieval. Verify version-sensitive details at the source.