[image] Roket:
Yes, almost everything is true. Only I need an array (“property_order”) of type:
That part should be relatively easy to achieve, just change the structure of the object that’s being pushed to the property_order array. So replace
item.property_order.push({
[keys[i]]: i
});
… Answer from MutedJam on community.n8n.io
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Global_Objects › Array › findIndex
Array.prototype.findIndex() - JavaScript | MDN
July 20, 2025 - The findIndex() method of Array instances returns the index of the first element in an array that satisfies the provided testing function. If no elements satisfy the testing function, -1 is returned.
is there a way to use .indexOf to find an object's value in an array?
Elizabeth Chai is having issues with: for example, var things More on teamtreehouse.com
2
How to get indexOf() from an id that's inside an object that's inside an array? I have provided an example.
Array.prototype.findIndex takes a function as its argument. That's right, functions themselves can be passed into functions! First, we can define a function that returns true if the uniqueId is 2 and false otherwise. function uniqueIdIsTwo(user) { return user.uniqueId === 2 } Then we can pass that function as the parameter of findIndex const index = myArray.findIndex(uniqueIdIsTwo) Notice how we're passing the function itself, we're not calling it! findIndex takes care of calling our function. In fact, findIndex calls our function for every element of the array and comes back with the index when our function returns true (or returns the magical -1 if our function never returns true). It's annoying to define a separate function each time, so we can also use an anonymous function instead. Anonymous means it doesn't have a name. Naming things is hard, so this is a useful thing to avoid naming it! const index = myArray.findIndex(function(user) { return user.uniqueId === 2}) Finally, we can also use arrow functions, which are a little more concise. There are differences between arrow functions and "regular" functions that are important to learn (some other time) but they are not different for this particular case. const index = myArray.findIndex(user => user.uniqueId === 2) More on reddit.com
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November 3, 2021Get index of object in array
How can I get the index of an obj in an array of objects? const arr = [ {x: "a", y: 1}, {x: "b", y: 2} ] const i = arr.indexOf({x: "a", y: 1}) console.log(i) // output: -1 I would expect the output to be 0, but it’s telling me the object does not exist. More on forum.freecodecamp.org
0
August 29, 2018How to find an object in an array using indexOf() ?
It would work if you had a reference to the original object const orig = {x:0,y:0} let lis = [orig,{x:20,y:0}] console.log(lis.indexOf(orig)) // 0 or let lis = [{x:0,y:0},{x:20,y:0}] const orig = lis[0] console.log(lis.indexOf(orig)) // 0 But there is no built-in compare-by-value for objects in JavaScript. If you're not comparing references to the same object, they won't match, even if they have the same values. You would need to create your own comparison function or use one from a library like lodash . Then you can use that with findIndex. let lis = [{x:0,y:0},{x:20,y:0}] console.log(lis.findIndex(el => isEqual(el, {x:0,y:0}))) // 0 More on reddit.com
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2
December 20, 2019Videos
02:38
Find Index of Object in Array javaScript - YouTube
09:40
JavaScript Tip: Locating an Object in an Array - YouTube
02:06
Easily Understand indexOf() - A JavaScript Array Method - YouTube
10:06
Javascript Arrays Made Simple: Indexing and Finding (Part 2) - YouTube
JavaScript for Beginners #33 indexOf() Method for Arrays - YouTube
03:56
Using the JavaScript indexOf Array Method - YouTube
Top answer 1 of 16
1394
I think you can solve it in one line using the map function:
const pos = myArray.map(e => e.hello).indexOf('stevie');
2 of 16
541
Array.prototype.findIndex is supported in all browsers other than IE (non-edge). But the polyfill provided is nice.
var indexOfStevie = myArray.findIndex(i => i.hello === "stevie");
The solution with map is okay. But you are iterating over the entire array every search. That is only the worst case for findIndex which stops iterating once a match is found.
There's not really a concise way (when devs had to worry about IE8), but here's a common solution:
var searchTerm = "stevie",
index = -1;
for(var i = 0, len = myArray.length; i < len; i++) {
if (myArray[i].hello === searchTerm) {
index = i;
break;
}
}
or as a function:
function arrayObjectIndexOf(myArray, searchTerm, property) {
for(var i = 0, len = myArray.length; i < len; i++) {
if (myArray[i][property] === searchTerm) return i;
}
return -1;
}
arrayObjectIndexOf(arr, "stevie", "hello"); // 1
Just some notes:
- Don't use for...in loops on arrays
- Be sure to break out of the loop or return out of the function once you've found your "needle"
- Be careful with object equality
For example,
var a = {obj: 0};
var b = [a];
b.indexOf({obj: 0}); // -1 not found
Sololearn
sololearn.com › en › Discuss › 2339895 › how-to-get-index-number-of-object-array-using-indexof-method-only-in-javascript
How to get index number of object array using indexOf method only in JavaScript? | Sololearn: Learn to code for FREE!
for(i of arr){ console.log(arr.indexOf(i)); } 10th Jun 2020, 4:32 PM · Abhay · + 2 · Thanks Abhay and thanks to infinite too · 10th Jun 2020, 4:59 PM · Dhruti · + 1 · I did this way but I want to do it for this array given below: var arr = [ {id : 1, value : 'a'}, {id : 2, value : 'b'} ] ; 10th Jun 2020, 4:20 PM ·
Top answer 1 of 2
1
Hi Elizabeth,
Using indexOf would have been feasible had your array only contained primitive types such as numbers, strings etc. but as your array contains objects, it needs a different approach.
Array.prototype.findIndex()
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/findIndex
So for example, this will work.
JavaScript
things.findIndex(i => i.item === "chips"); // 3
Then having found that chips is located at index 3, the price is found like so.
JavaScript
things[3].price; // '3.45'
But as suggested by James, 'find' may suit your needs better.
Array.prototype.find()
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find
So for this, we first need a simple callback which includes the searched item
JavaScript
function search(things) {
return things.item === 'chips';
}
Now run this
JavaScript
things.find(search) // { item: 'chips', price: '3.45' }
So with this method, we are not told the index, but we do find the other 'key:value' located at the same index.
2 of 2
0
indexOf just gets the first index, if you want the value of an element try the find method.
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Global_Objects › Array › indexOf
Array.prototype.indexOf() - JavaScript | MDN
const beasts = ["ant", "bison", "camel", "duck", "bison"]; console.log(beasts.indexOf("bison")); // Expected output: 1 // Start from index 2 console.log(beasts.indexOf("bison", 2)); // Expected output: 4 console.log(beasts.indexOf("giraffe")); // Expected output: -1 ... Element to locate in the array. ... Zero-based index at which to start searching, converted to an integer. Negative index counts back from the end of the array — if -array.length <= fromIndex < 0, fromIndex + array.length is used.
GeeksforGeeks
geeksforgeeks.org › javascript › javascript-program-to-find-index-of-an-object-by-key-and-value-in-an-array
JavaScript Program to Find Index of an Object by Key and Value in an Array - GeeksforGeeks
July 23, 2025 - This method iterates over the array elements and uses Object.entries() to get an array of key-value pairs from the object. We then check if the object contains the specified key and if its value matches the given value. Example: In this example, we will find the index of an object by key and value in a JavaScript array using the for...of loop and Object.entries().
GeeksforGeeks
geeksforgeeks.org › javascript › javascript-indexof-method-in-an-object-array
JavaScript indexOf() method in an Object Array - GeeksforGeeks
March 14, 2024 - JavaScript · let fruits = [ { name: 'apple', color: 'red' }, { name: 'banana', color: 'yellow' }, { name: 'orange', color: 'orange' } ]; // Find the index of an object in the array let index = fruits.indexOf({ name: 'banana', color: 'yellow' }); console.log(index); // Output: -1 (Not found) Output ·
Reddit
reddit.com › r/learnjavascript › how to get indexof() from an id that's inside an object that's inside an array? i have provided an example.
r/learnjavascript on Reddit: How to get indexOf() from an id that's inside an object that's inside an array? I have provided an example.
November 3, 2021 -
Hi everyone, I have been stuck on this for about 10 hours now....
Let me post the code, then explain exactly what I need to do.
Here's my array:myArray[obj, obj, obj];
Here's my objects that are inside the array:obj {name : "keith", uniqueId : 0}obj {name : "keith", uniqueId : 1}obj {name : "keith", uniqueId : 2}
Here's what I need to do:
I need to get the indexOf() these objects based on that uniqueId. The objects will be moved around the array and could be in any position.
myArray[obj, obj, obj];obj {name : "keith", uniqueId : 0} //myArray index 2obj {name : "keith", uniqueId : 1} //myArray index 0obj {name : "keith", uniqueId : 2} //myArray index 1
So how do I do this? I'd like to do something like:indexOf(object with the unique id of 2) // 1
Top answer 1 of 9
46
Array.prototype.findIndex takes a function as its argument. That's right, functions themselves can be passed into functions! First, we can define a function that returns true if the uniqueId is 2 and false otherwise. function uniqueIdIsTwo(user) { return user.uniqueId === 2 } Then we can pass that function as the parameter of findIndex const index = myArray.findIndex(uniqueIdIsTwo) Notice how we're passing the function itself, we're not calling it! findIndex takes care of calling our function. In fact, findIndex calls our function for every element of the array and comes back with the index when our function returns true (or returns the magical -1 if our function never returns true). It's annoying to define a separate function each time, so we can also use an anonymous function instead. Anonymous means it doesn't have a name. Naming things is hard, so this is a useful thing to avoid naming it! const index = myArray.findIndex(function(user) { return user.uniqueId === 2}) Finally, we can also use arrow functions, which are a little more concise. There are differences between arrow functions and "regular" functions that are important to learn (some other time) but they are not different for this particular case. const index = myArray.findIndex(user => user.uniqueId === 2)
2 of 9
7
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/findIndex
Mozilla
developer.mozilla.org › en-US › docs › Web › JavaScript › Guide › Indexed_collections
Indexed collections - JavaScript | MDN
The indexOf() method searches the array for searchElement and returns the index of the first match.
freeCodeCamp
freecodecamp.org › news › javascript-standard-objects-arrays
JavaScript Standard Objects: Arrays
January 26, 2020 - If the element is not in the array, indexOf returns -1. ... fromIndex (Optional): The index at which you want to start the search at. If the fromIndex is greater than or equal to the array’s length, the array is not searched and the method returns -1. If the fromIndex is a negative number, it considered an offset from the end of the array (the array is still searched forwards from there).
GeeksforGeeks
geeksforgeeks.org › javascript › javascript-get-the-index-of-an-object-by-its-property
JavaScript Get the index of an object by its property - GeeksforGeeks
October 14, 2025 - let arrayObj = [{ prop_1: 'val', prop_2: 'val_12', prop_3: 'val_13' }, { prop_1: 'val', prop_2: 'val_22', prop_3: 'val_23' }]; function findIndexInArray() { let prop = 'prop_2'; let val = 'val_22'; console.log("Index of prop = " + prop + " val = " + val + " is = " + arrayObj.map(function (e) { return e.prop_2; }).indexOf(val)); } findIndexInArray(); Output · Index of prop = prop_2 val = val_22 is = 1 · Syntax: array.map(function(currentValue, index, arr), thisValue) Using for loop we can iterate over the array of objects and check the given value of prop matches or not. JavaScript ·
W3Schools
w3schools.com › jsref › jsref_indexof_array.asp
JavaScript Array indexOf() Method
The indexOf() method starts at a specified index and searches from left to right (from the given start postion to the end of the array).
JavaScript Tutorial
javascripttutorial.net › home › javascript array methods › array.prototype.indexof()
JavaScript Array indexOf() Method
November 6, 2024 - To locate an object in an array ... { guestIndex: 0 }Code language: JavaScript (javascript) Use the JavaScript array indexOf() method to locate an element in the array....
freeCodeCamp
forum.freecodecamp.org › javascript
Get index of object in array - JavaScript - The freeCodeCamp Forum
August 29, 2018 - How can I get the index of an obj in an array of objects? const arr = [ {x: "a", y: 1}, {x: "b", y: 2} ] const i = arr.indexOf({x: "a", y: 1}) console.log(i) // output: -1 I would expect the output to be 0, but it’s t…
Mimo
mimo.org › glossary › javascript › array-indexof-method
JavaScript Array indexOf() method: Syntax, Usage, and Examples
The indexOf() method lets you search an array for a specific value and returns its first index. If the value isn’t found, it returns -1. The JavaScript array indexOf method is a quick and reliable way to determine the position of an element in an array, especially when working with primitive ...
TutorialsPoint
tutorialspoint.com › home › javascript › javascript array indexof method
JavaScript Array indexOf Method Explained
September 1, 2008 - The JavaScript Array indexOf() method is used to return the first occurrence index of a specified element within an array (if it is present at least once).
Medium
medium.com › @gautamshekhar078 › javascript-indexof-array-method-b340a97c29b6
JavaScript IndexOf() Array Method | by Gautamshekhar | Medium
November 25, 2024 - const sentence = 'The quick brown fox jumps over the lazy dog'; const index = sentence.indexOf('fox'); console.log(index); // 16
Medium
medium.com › @navyjot › javascript-indexof-and-findindex-in-array-bc611eccf0d8
Javascript : IndexOf and FindIndex in Array. | by Navjot | Medium
May 23, 2020 - So i took to array one simple array and another array of objects, and i ran both of these commands on them ... So my verdict is that the best case scenario is that we should use indexOf for simple array and findIndex on on array of objects.
ServiceNow Community
servicenow.com › community › developer-forum › get-index-of-javascript-object-with-array › m-p › 1505211
Solved: get index of Javascript object with Array - ServiceNow Community
August 5, 2017 - From the title, i see you are looking for getting the index of an array in Javascript object( based on a value)? Please correct me if I am wrong. If thats the case, you can use 'map' function. Also, I think the inc2 one line # 1 is typo, I corrected it. var inc1 = { num: 'INC111', sd: 'email' }; var inc2 = { num: 'INC222', foo: 'internet' } var arr = []; arr.push(inc2,inc1); pos = arr.map(function(input) { return input.num; }).indexOf('INC111'); gs.log(pos); Hope this helps.