What is difference between Object.Freeze and Object.seal

Both freeze and seal are used to create non extensible objects in JavaScript, but there are plenty of differences between them. Object.seal() allows changes to the existing properties of an object whereas Object.freeze() does not allow so. Object.freeze() makes an object immune to everything even little changes cannot be made. Object.seal() prevents from deletion of existing properties but cannot prevent them from external changes.

  // creates an object

    var obj = {

        // assigns 10 to value

        value: 10

    };

    // creates a non-extensible object

    Object.freeze(obj);

    // updates the value

    obj.value = 20;

    // but cannot change the existing value

    console.log(obj.value);

 // creates an object

    var obj = {

        // assigns 10 to value

        value: 10

    };

    // creates a non-extensible object

    Object.seal(obj);

    // the value gets updated to 20

    obj.value = 20;

    console.log(obj.value);

references:

https://www.geeksforgeeks.org/what-is-the-difference-between-freeze-and-seal-in-javascript/