An Overview of JavaScript Object.seal() Method for Beginners

An Overview of JavaScript Object.seal() Method for Beginners

JavaScript Object.seal() Method ensures no new properties and methods to be added to the sealed object. The Object.seal() function prevents adding, removing, or re-configuring properties on a JavaScript object.

JavaScript Object.seal() Method ensures no new properties and methods to be added to the sealed object. But the existing object properties value can updated.

Syntax

Object.seal(object);

The Object.seal() Method takes object as parameter and returns new sealed object.

var fruit = {"name" : "Apple", "color" : "red"};
Object.seal(fruit);

//adding new property `weight`
fruit.weight = "56.02 grams"; 

//adding new function `get_name`
fruit.get_name = function(){
    return this.name.toUpperCase();
};

console.log(fruit); //displaying object 
console.log(fruit.get_name());  //calling object method

//Console Output
{name: "Apple", color: "red"}
Uncaught TypeError: fruit.get_name is not a function

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