How to use for..in loop In Javascript
It is a naive approach to solve this problem. In this approach, we iterate the obj2 using the for..in loop, and at every iteration, we check the current key of both objects are not equal we return false otherwise after completion the loop we return true.
Example: In this example, we are using the above-explained approach.
// Define the first object
let obj1 = {
name: "John",
age: 23,
degree: "CS"
}
// Define the second object
let obj2 = {
age: 23,
degree: "CS"
}
// Define the function check
function check(obj1, obj2) {
// Iterate the obj2 using for..in
for (key in obj2) {
// Check if both objects do
// not have the equal values
// of same key
if (obj1[key] !== obj2[key]) {
return false;
}
}
return true
}
// Call the function
console.log(check(obj1, obj2))
Output
true
How to compare two objects to determine the first object contains equivalent property values to the second object in JavaScript ?
In this article, we are going to learn about comparing two objects to determine if the first object contains equivalent property values to the second object, In JavaScript, comparing the values of two objects involves checking if they have the same properties with corresponding values. Given two objects obj1 and obj2 and the task are to check that obj1 contains all the property values of obj2 in JavaScript.
Input: obj1: { name: "John", age: 23; degree: "CS" }
obj2: {age: 23, degree: "CS"}
Output: true
Input: obj1: { name: "John", degree: "CS" }
obj2: {name: "Max", age: 23, degree: "CS"}
Output: false
To solve this problem we follow the following approaches.
Table of Content
- Using for..in loop
- Using Object.keys() and Array.every()
- Using JSON.stringify()
- Using a custom function
- Using Object.entries()
- Using Map Object
We will explore all the above methods along with their basic implementation with the help of examples.