JavaScript Array findIndex() Method
You are Here:
JavaScript Array findIndex() Method
The findIndex()
method returns the index of the first element in the array that passes the provided testing function. Otherwise, it returns -1, indicating that no element passed the test.
Note: This method does not alter the original array.
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<p>Find the index of first odd number<p>
<script>
var myNumber = [1, 2, 3, 4, 5, 6, 7];
function odd(num) {
return (num % 2) != 0;
}
document.write(myNumber.findIndex(odd));
</script>
</body>
</html>
Syntax
Array.findIndex(function(value, index, arr), thisArg);
//or
Array.findIndex(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>
<p>Find the index of first odd number<p>
<script>
var myNumber = [1, 2, 3, 4, 5, 6, 7];
function odd(num, index, arr) {
return (num % this) != 0;
}
document.write(myNumber.findIndex(odd, 2));
</script>
</body>
</html>
Reminder
Hi Developers, we almost covered 97% of JavaScript Tutorials with examples for quick and easy learning.
We are working to cover every Single Concept in JavaScript.
Please do google search for:
Join Our Channel
Join our telegram channel to get an instant update on depreciation and new features on HTML, CSS, JavaScript, jQuery, Node.js, PHP and Python.
This channel is primarily useful for Full Stack Web Developer.