Let us find if any adult is there is queue or not. Let us see the below example in javascript to check the index of the first prime element present in the array. Examples to Implement findIndex() in JavaScriptįollowing are the example are given below: Example #1 Here 2 means numbers = 19 is an odd number. Let us find the first Odd element in the array Please click the buttonĭocument.getElementById('demo').innerHTML = numbers.findIndex(isOdd)

Index and array argument is also being passed. Here every element is checked for idd condition, and the index of the first odd element is returned. Here our function is idOdd and the value being passed using ages.findIndex() command. Let’s say a function is isOdd – that checks if the given value is odd or not. thisArg: This denotes the value that needs to be specified in “this value”.Array: This is an optional argument that denotes the array whose values are being checked for the given condition.Index: This denotes the current index for which the function is called.currentValue: This denotes the value present at the current index in the array.In case no such element is present in the array that satisfies the specified condition.įunction specified is called using three arguments:.Array specified in the argument has no elements, that is, if it is an empty array.In case any of the below 2 conditions is true, -1 is returned instead of any index value. In this complete work, elements of the array remain unchanged. Once such an element is discovered in the array, the position of the element in the array is returned by the function. It is executed until a value is found that returns true for the specified condition. The findIndex() method executes the function specified in the argument for each and every index value of the array. How findIndex() Method Works in JavaScript?

Note: Here, the original values of the array being referred to the remain unchanged.

Javascript array findindex