javascript instance method
Map.prototype.get()
The get() method of Map instances returns the value corresponding to the key in this Map, or undefined if there is none. Object values are returned as the same reference that was originally stored, not as a copy, so mutations to the returned object will be reflected anywhere that reference is held, including inside the Map.
Interactive exampleOpen the canonical MDN source to run this embedded demo.
const map = new Map();
map.set("bar", "foo");
console.log(map.get("bar"));
// Expected output: "foo"
console.log(map.get("baz"));
// Expected output: undefined
Syntax
get(key)
Parameters
key- : The key of the value to return from the
Mapobject. Object keys are compared by reference, not by value.
- : The key of the value to return from the
Return value
The value associated with the specified key in the Map object. If the key can’t be found, undefined is returned.
Examples
Using get()
const myMap = new Map();
myMap.set("bar", "foo");
console.log(myMap.get("bar")); // Returns "foo"
console.log(myMap.get("baz")); // Returns undefined
Using get() to retrieve a reference to an object
const arr = [];
const myMap = new Map();
myMap.set("bar", arr);
myMap.get("bar").push("foo");
console.log(arr); // ["foo"]
console.log(myMap.get("bar")); // ["foo"]
Specifications
SpecificationsStandards references are available on the canonical MDN page.
Browser compatibility
Browser compatibilityCompatibility data is available on the canonical MDN page.