So,let's see simple example that will help you. How to Get the Index of an Array that Contains Objects in JavaScript It’s similar to what we did previously with the array of strings, just with an extra step. JavaScript Array indexOf Convert an array into String react?| Array map Let’s say I have an array of unidentified objects, which contain the Array of named objects , and we need to get the object where “name” is “some string .” Access array of objects by index in React.js - Stack Overflow object indexOf method in an object array in JavaScript - GeeksforGeeks Modify the object property using the new variable. I'm working on a react.js project and I need to access an array of objects. react array find index Code Example - codegrepper.com const array1 = [5, 12, 8, 130, 44]; const isLargeNumber = (element) => element > 13; console.log(array1.findIndex(isLargeNumber)); // expected output: 3 See the code below. Definition and Usage. Find the object from an array by using property To get an index of an object from an array of objects, we can use the findIndex() array method on the array containing the object elements in JavaScript. Starting at index [0] a function will get called on index [0], index [1], index [2], etc… forEach will let you loop through an array nearly the same way as a for loop: It takes the object that you want to loop over as an argument and returns an array containing all properties names (or keys). It returns the x (where x is a single integer). Log In Sign Up. react JavaScript: find an object in array based on object's property (and learn about the "find" function) Report this post Rafa Oliveira Array.find () method runs the callback function on every element present in the array and returns the first matching element. Otherwise, it returns undefined. Find the object from an array by using property We will use the map function to access each object from the array. TypeScript provide findIndex() method to get index of element in array, we can also use this method to find index of object in array. If no key is specified, React will present a warning and use the array index as a key by default. Find index of matching object in array? : reactjs How to Search an Array of Objects in JavaScript (React) If this is left empty, “Undefined” will be used. We have returned the g.item from an array of objects and found the index of a given value. If you don't have unique database ids at hand, you could also use the numeric index of your array like this: The Array.prototype.findIndex() method returns an index in the array if an element in the array satisfies the provided testing function; otherwise, it will return -1, which indicates that no element passed the test. find index of object in array react code example Example 1: javascript get index of object with value in array // Get index of object with specific value in array const needle = 3 ; const haystack = [ { id : 1 } , { id : 2 } , { id : 3 } ] ; const index = haystack . Our array of names has expanded, and so I renamed the array to be named people.