In the following example, objects were stringified () at first and then compared with each other. Yikes! This method is useful when we need . Instead of this, we can use JSON.stringify () as below: To compare objects in TypeScript: Use JSON.stringify () to compare objects whose keys are in the same order. Comparing object keys and values is more complex. That each item is equal to its counterpart in the other array or object. Method 1: Array.findIndex () to find the search index. Then even if the object is modified, the hook won't re-run because it doesn't do the deep object comparison between these dependency changes for the object. Here to compare we have to first stringify the object and then using equality operators it is possible to compare the objects. multidimensional array), irrespective of its dimension. JavaScript object comparison | Stamat In this post, I will explain the solution of the Deep Comparison exercise in the Eloquent Javascript book (3rd edition, chapter 4): Write a function deepEqual that takes two values and returns true… Equality for two JavaScript objects - GeeksforGeeks 4. In Example 4, Object.is(obj1,obj2); would return true. Use for of for arrays and for in for objects. In other words, filter () gives you a new array containing just the elements you need. The == operator compares objects by identity. If x and y are numbers, it checks if either of x or y is NaN, and returns false if one is NaN. But sometimes, you would prefer to compare the values of their actual properties. Happy testing :). I had 10 object to be filtered in 4 different ways. First, we convert the JavaScript objects to JSON strings and then compare those strings . To compare two Arrays in JavaScript, you should check that the length of both arrays should be the same, the objects presented in it be the same type, and each item in one array is equivalent to the counterpart in the compared array.