console.log(user.id,user.name)); forEach methods takes the callback function as an argument and runs on each object present in the array. freeCodeCamp's open source curriculum has helped more than 40,000 people get jobs as developers. Summary: in this tutorial, you will learn how to use the JavaScript Array forEach() method to exeucte a function on every element in an array. The typeof operator in JavaScript returns "object" for arrays. The better way to loop through objects is first to convert the object into an array. const obj = { name: 'Jean-Luc Picard', rank: 'Captain' }; // Prints "name Jean-Luc Picard" followed by "rank Captain" Object.keys (obj).forEach (key => { console.log (key, obj [key]); }); "0", "1", etc.). value: JavaScript Tutorial: JavaScript Array Iteration. Arrays. Notice how each item in the new object uses the array index of the value as the key (i.e. elements without values. Required. Get started, freeCodeCamp is a donor-supported tax-exempt 501(c)(3) nonprofit organization (United States Federal Tax Identification Number: 82-0779546). Otherwise, if we call it, it will just get printed as many times as the number of elements of the array: You can see the example usage of the forEach( ) method in this video: The Array.forEach method is supported in all browsers expect IE version 8 or earlier: If you want to learn more about Web Development, feel free to visit my Youtube Channel. cars.forEach(car => { car['size'] = "large"; if (car.capacity <= 5){ car['size'] = "medium"; } if (car.capacity <= 3){ car['size'] = "small"; } }); Sort an Array of Objects in JavaScript Summary : in this tutorial, you will learn how to sort an array of objects by the values of the object’s properties. 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