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JavaScript Array findIndex Function
The findIndex() method of JavaScript is used to return the index of the first element in an array, if the condition is passed.
The syntax is as follows −
array.findIndex(function(currentValue, index, arr), thisValue)
Let us now implement the findIndex() method in JavaScript −
Example
<!DOCTYPE html>
<html>
<body>
<h2>Rank</h2>
<button onclick="display()">Result</button>
<p id="demo"></p>
<p>Finding the index of the player with highest rank.</p>
<script>
var points = [100, 150, 200, 250, 300, 400];
function topRank(points) {
return points >= 400;
}
function display() {
document.getElementById("demo").innerHTML = "index = "+points.findIndex(topRank);
}
</script>
</body>
Output
Click “Result” to get the index −
Example
<!DOCTYPE html>
<html>
<body>
<h2>Rank</h2>
<button onclick="display()">Result</button>
<p id="demo"></p>
<p>Finding the index of the player with specific rank points.</p>
<script>
var points = [100, 150, 200, 250, 300, 400];
function topRank(points) {
return points == 200;
}
function display() {
document.getElementById("demo").innerHTML = "index = "+points.findIndex(topRank);
}
</script>
</body>
Output
Above, click the button “Result” −
Updated on: 2019-12-17T07:27:58+05:30
647 Views
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