JavaScript Array findIndex()

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The JavaScript array findIndex() method is used to return the index value of the first element in the given array that satisfies the specified condition.

Syntax:

array.findIndex (callback  (value,index,arr), thisArg)

Parameters:
callback: It represents the method to test the condition. It is required.
currentValue: It represents the array’s current element. It is required.
index: Current element index. It is optional.
arr: It represents the array on which every() method is to be invoked. It is optional.
thisArg: It is used as this keyword while executing callback. It is optional.

Returns:
Array’s first element that satisfies the function condition.

Example:

<!DOCTYPE html>
<html>
<head>
</head>
<body>
<script>
var a = ["GOLD","SILVER","DIAMOND","RUBY","PLATINUM"]
var result=a.findIndex(x=> x>"GOLD");
document.writeln(result)
</script>
</body>
</html>