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JavaScript Array filter() Method
  • Last Updated : 30 Dec, 2020

Below is the example of the Array filter() method. 
 

  • Example: 
     

JavaScript




<script>
    // JavaScript to illustrate findIndex() method
    function canVote(age) {
        return age >= 18;
    }
  
    function func() {
        var filtered = [24, 33, 16, 40].filter(canVote);
        document.write(filtered);
    }
    func();
</script>                    


  • Output: 
     
[24,33,40]

The arr.filter() method is used to create a new array from a given array consisting of only those elements from the given array which satisfy a condition set by the argument method. 
Syntax: 
 

array.filter(callback(element, index, arr), thisValue)

Parameters: This method accepts five parameter as mentioned above and described below: 
 

  • callback: This parameter holds the function to be called for each element of the array.
  • element: The parameter holds the value of the elements being processed currently.
  • index: This parameter is optional, it holds the index of the currentValue element in the array starting from 0.
  • arr: This parameter is optional, it holds the complete array on which Array.every is called.
  • thisValue: This parameter is optional, it holds the context to be passed as this to be used while executing the callback function. If the context is passed, it will be used like this for each invocation of the callback function, otherwise undefined is used as default.

Return value: This method returns a new array consisting of only those elements that satisfied the condition of the arg_function
Below examples illustrate the arr.filter() method in JavaScript:
 

  • Example 1: In this example, the method filter() creates a new array consisting of only those elements that satisfy the condition checked by isPositive() function.
     
function isPositive(value) {
  return value > 0;
}

var filtered = [112, 52, 0, -1, 944].filter(isPositive);
print(filtered);


  • Output: 
     
[112,52,944]


  • Example 2: In this example, the method filter() creates a new array consisting of only those elements that satisfy the condition checked by isPositive() function.
     
function isEven(value) {
  return value % 2 == 0;
}

var filtered = [11, 98, 31, 23, 944].filter(isEven);
print(filtered);


  • Output: 
     
[98,944]


Codes for the above methods are defined as follows: 
Program 1: 
 



JavaScript




<script>
    // JavaScript to illustrate filter() method
    function isPositive(value) {
        return value > 0;
    }
  
    function func() {
        var filtered = [112, 52, 0, -1, 944].filter(isPositive);
        document.write(filtered);
    }
    func();
</script>


Output: 
 

[112,52,944]

Program 2: 
 

JavaScript




<script>
    // JavaScript to illustrate filter() method
    function isEven(value) {
        return value % 2 == 0;
    }
  
    function func() {
        var filtered = [11, 98, 31, 23, 944].filter(isEven);
        document.write(filtered);
    }
    func();
</script>


Output: 
 

[98,944]

Supported Browsers: The browsers supported by JavaScript Array filter() method are listed below: 
 

  • Google Chrome
  • Microsoft Edge 9.0
  • Mozilla Firefox 1.5
  • Safari
  • Opera

 

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