In this case, there is 20 which is 4th index.Īnd exit the loop and it won’t go any further. This will get the very first element of the ages array as soon as it finds any number that is above 18. Let’s say I want to find the first element which is over 18 in the ages array. The parameter age will have an element from an array on each iteration.įinally, add the condition inside the arrow function We need to pass an arrow function as an argument with the parameter called age to the find() method const ages = To capture each element on each iteration Find() Method In Actionįirst, invoke the find() method in the ages javascript array. Including the second element that meets the condition. Until the condition we specify is met or satisfied. The find() method will search the very first element from a given javascript array It’s one of the higher order functions similar to map, reduce, filter etc.Īny function that accepts or return another function called higher-order functions.Īpparently find() will only take a function as an argument which is required. The find() method can only be invoked on a Javascript array. Find A Specific Array Index Using findIndex().The following example uses findIndex() method to find the first occurrence of a prime number in a given array. The findIndex() executes testFunc() for every element of the array and if true is returned by the testFunc(), findIndex() returns the index of that element and does not check for the rest of the array elements Example Code In JavaScript, "this" keyword refers to the object it belongs to. If it is empty, the value "undefined" will be passed as its "this" value. It is an optional argument that is passed to the function and used as its "this" value. arr: This is the array that the findIndex() was called upon. Index: Indicates the index of the current element being processed. The testFunc() is a function that is used to execute a condition on each element of the array until the function returns true, indicating that the element satisfying the condition was found.ĬurrentValue: This indicates the current element in the array being processed. The above findIndex() method takes two arguments: The syntax of the findIndex() method is as follows findIndex(testfunc(currentValue, index, arr), thisValue) If no element of the array satisfies the testing condition, it returns -1. The findIndex() method returns the index of the first element in array that satisfies the given testing function. The prototype constructor allows you to add new properties and methods to the Array() object.
This method was added to the array.prototype() in the JavaScript ES6. Today, let us understand how the findIndex() method works. JavaScript methods are actions that can be performed on objects.
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