JavaScript Array map() Method
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JavaScript Array map() Method
The map() method creates a new array with the results of calling a provided function on every element in the calling array.
Note: This method does not alter the original array.
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<script>
var myNumber = [1, 2, 3, 4, 5, 6, 7];
var myMap = [];
var multiValue = 10;
function multiply(value){
return e = value * multiValue;
}
myMap = myNumber.map(multiply);
document.write("myNumber array = " +myNumber);
document.write("<br>myMap array = " +myMap);
</script>
</body>
</html>
Syntax
Array.map(function(value, index, arr), thisArg);
//or
Array.map(functionName);
Parameter Values
| Value | Type | Explanation |
|---|---|---|
| function(value, index, arr) | Required | Function to test for each element in an array. Value - Specifies a value or element in an array. index - Specifies the index of a value or element in an array. arr - Specifies the whole array. |
| thisArg | Optional | Specifies a value against which each element in an array is tested. |
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<script>
var myNumber = [1, 2, 3, 4, 5, 6, 7];
var myMap = [];
function multiply(value, index, arr){
return e = value * this;
}
myMap = myNumber.map(multiply, 10);
document.write("myNumber array = " +myNumber);
document.write("<br>myMap array = " +myMap);
</script>
</body>
</html>
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