Map getOrInsert()The getOrInsert() and getOrInsertComputed() methods of Map objects get a value, setting and getting a default value if needed.mapsMapsnewly2026-02-14https://tc39.es/ecma262/multipage/keyed-collections.html#sec-map.prototype.getorinserthttps://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Map/getOrInsertjavascript.builtins.Map.getOrInsertjavascript.builtins.Map.getOrInsertComputedjavascript.builtins.WeakMap.getOrInsertjavascript.builtins.WeakMap.getOrInsertComputedhttps://nowyoucanuse.com/features--getorinsert.html