JavaScript Map values() Method
The JavaScript map.values() method is used to return a new Iterator object that contains the value of each element present in Map. The order of the values are in the same order that they were inserted into the map.
Syntax:
myMap.values()Parameters:
- This method does not accept any parameters.
Example 1:
<script>
let myMap = new Map();
// Adding key value pair with chaining
myMap.set(1, "India");
myMap.set(2, "England");
myMap.set(3, "Canada");
// Creating a Iterator object
const mapIterator = myMap.values();
// Getting values with iterator
console.log(mapIterator.next().value);
console.log(mapIterator.next().value);
console.log(mapIterator.next().value);
</script>
Output :
India
England
Canada
Example 2:
<script>
let myMap = new Map();
// Adding key value pair with chaining
myMap.set(1, "India");
myMap.set(2, "England");
myMap.set(3, "Canada");
myMap.set(4, "Russia");
// Creating a Iterator object
const mapIterator = myMap.values();
// Getting values with iterator
let i = 0;
while (i < myMap.size) {
console.log(mapIterator.next().value);
i++;
}
</script>
Output:
India
England
Canada
Russia
Supported Browsers:
- Chrome 38
- Edge 12
- Firefox 19
- Opera 25
- Safari 8
JavaScript Map values() Method – FAQs
What does the values() method do in JavaScript Map?
The values() method in JavaScript Map returns a new iterator object that contains the values for each element in the Map object in insertion order.
Performance considerations with values()?
The values() method has a time complexity of O(1), making it very efficient for accessing the values of a Map.
When should values() be used?
values()is useful when you need to iterate through or perform operations specifically on the values of a Map, such as checking, manipulating, or processing the stored values.
What are some practical applications of the values() method with Map?
Practical applications of the
values()method include iterating over values to perform value-based operations, checking for the existence of specific values, and transforming map values into other data structures.
What is the most common use of the values() method?
Most Common Use Cases:
- Retrieving all values from a
Mapfor processing or displaying them.- Checking for the existence of specific values in a
Map.- Implementing data manipulation or transformation based on values stored in a
Map.
