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The map() method in JavaScript creates an array by calling a specific function on each element present in the parent array. It is a non-mutating method. Generally map() method is used to iterate over an array and calling function on every element of array.
Syntax:
array.map(function(currentValue, index, arr), thisValue)
Parameters: This method accepts two parameters as mentioned above and described below:
- function(currentValue, index, arr): It is required parameter and it runs on each element of array. It contains three parameters which are listed below:
- currentValue: It is required parameter and it holds the value of current element.
- index: It is optional parameter and it holds the index of current element.
- arr: It is optional parameter and it holds the array.
- thisValue: It is optional parameter and used to hold the value of passed to the function.
Return Value: It returns a new array and elements of arrays are result of callback function.
Below examples illustrate the use of array map() method in JavaScript:
Example 1: This example use array map() method and return the square of array element.
Output:
Example 2:
