This custom function simulates the behavior of the Array.filter() function. This function checks the conditions and gets all the elements instead of the first one. Since no odd numbers are present therefore it returns -1. The indexOf () method returns the first index at which a given element can be found in the array, or -1 if it is not present. This example uses JavaScript find() and defines a custom function. Output: In this example, the function findIndex () finds all the indices that contain odd numbers. JavaScript find() with external callbackįind(function callback(element, index, array) ) => product_name = 'Computer') ĭocument.write("Product_Name: "+result.product_name+"") įind all elements satisfying condition in the callback We have used the arrow function and this parameter in JavaScript forEach() examples. To find index of a given element in array in JavaScript, call indexOf() method on this array and pass the element to find as argument to this indexOf(). It supports the arrow function to map the array components to the callback function. It then returns the index of the first element that satisfies the provided testing function. The method executes a provided function once for each element present in the array, in order. It has the ‘ this’ parameter which supplies the object and changes the default context. Find Index Of Object Using findIndex () Method The findIndex () method is used to find the index of an element in an array. This function accepts the callback function to apply the search condition. Below code snippets show the valid syntaxes of this function. The JavaScript find() function can be used with different syntax. Let’s know the syntax of find() to search elements from a collection of JavaScript array elements. JavaScript findIndex() Get Index Number of First Element that meets the given Condition - findIndex() method returns the index number of first element from a given array, that satisfies the given condition. It prints the following output in the document window. Document.write("Input Array: " + mark +"") ĭocument.write("Mark greater than 50 is: " + findResult)
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