Sometimes, we want to use JavaScript Object.defineProperty method.
In this article, we’ll look at how to use JavaScript Object.defineProperty method.
How to use JavaScript Object.defineProperty method?
To use JavaScript Object.defineProperty method, we can call it with the object we want to add a property to, the property name, and an object with properties to configure the property.
For instance, we write
const employee = {
firstName: "jane",
lastName: "smith",
};
Object.defineProperty(employee, "toString", {
value() {
return `${this.firstName} ${this.lastName}`;
},
writable: true,
enumerable: true,
configurable: true,
});
console.log(employee.toString());
to call Object.defineProperty with employee to add the toString method to it.
We define its value as a getter that returns the firstName and lastName properties combined.
And then we set writable to true. to let us reassign it.
enumerable is true means we can return its value with Object.keys, Object.values, etc.
And configurable set to true means we can change the object’s configurability, writability and enumerability.
Conclusion
To use JavaScript Object.defineProperty method, we can call it with the object we want to add a property to, the property name, and an object with properties to configure the property.
