JavaScript TypedArray map() Method

The JavaScript map() method form a new array creates a new typed array with the results of calling a provided function on every element in this typed array.

NOTE: map() method does not change the actual array.

Syntax:

Parameters:

Value(Required): The value of the current element.

Index(Optional): The array index of the current element.

arr(Optional): The array map() was called upon.

ThisValue(Optional): A value to be passed to the function to be used as its "this" value.

Return value:

A new array.

Browser Support:

Chrome	Yes
Safari	Yes
Firefox	1.5
Opera	Yes

Example 1

JavaScript map() Method

<script type="text/javascript">
// JavaScript to illustrate map() method
var input=[1,2,3];
var output=input.map(function(input)
{
return input*2;
});
document.write("Array after using map() method the output is" );
document.write("<br>");
document.write(output);
document.write("<br>");
document.write("Actual array still remain the same ");
document.write("<br>");
document.write(input);
// expected output: arr[Output:2,4,6]
</script>

Test it Now

Output:

2,4,6

Example 2

JavaScript map() Method

<script type="text/javascript">
// JavaScript to illustrate map() method
var JavaTpoint = ['JavaTpoint','C','C++','RDBMS'];
//Determine the length of each name and save it in an array
var nameLengths =JavaTpoint.map(function(value, index, array)
{
var len =value.length;
return len;
});
document.write("Array using map() method the output is" );
console.log(nameLengths);
document.write(nameLengths);
document.write("<br>")
document.write("Actual array still remain the same ");
document.write(JavaTpoint);
// expected output: arr[Output:10,1,3,5]
</script>

Test it Now

Output:

10,1,3,5

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