What is the Map.get method in JavaScript?

The get method of the Map object is used to get the value associated with the passed key.

Syntax

mapObj.get(key);

Arguments

key : The key for which the value is to be returned.

Return value

The get method returns the value associated with the passed key. If there is no entry for the passed key, then undefined is returned.

Code

let map = new Map();
map.set("one", 1);
map.set("two", 2);
map.set("three", 3);
console.log("Getting value of key one :", map.get("one") );
console.log("Getting value of key three :", map.get("three") );
console.log("Getting value of key four :", map.get("four") );

Explanation

In the code above:

  • We have created a map object and added three entries to it.
one - 1
two - 2
three - 3

  • Then we called the get method for the key one, three and four.

  • For the key one and three, the value 1 and 3 is associated respectively. The result will be as follows:

map.get('one') will return  1
map.get('three') will return 3
  • But, there is no value associated with the key four. So, undefined is returned for get('four').

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