How to use Map Object In Javascript
In this approach, we convert both objects into Map objects and then compare their key-value pairs. This method is useful when dealing with more complex objects and ensures that we check both keys and values effectively.
Example: In this example, we convert both objects into Map objects and compare their entries. If the entries of obj2 are found in obj1 with the same values, the function returns true.
// 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 using Map
function check(obj1, obj2) {
let map1 = new Map(Object.entries(obj1));
let map2 = new Map(Object.entries(obj2));
for (let [key, value] of map2) {
if (!map1.has(key) || map1.get(key) !== value) {
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.