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JavaScript Function Call

JS Function Call

With the call() method, you can write a method that can be used on different objects.

The JavaScript call() Method

The call() method is a predefined JavaScript method.

It can be used to invoke (call) a method with an owner object as an argument (parameter).

With call(), an object can use a method belonging to another object.

					 
        
          const person = {
            fullName: function() {
              return this.firstName + " " + this.lastName;
            }
          }
          const person1 = {
            firstName:"John",
            lastName: "Doe"
          }
          const person2 = {
            firstName:"Mary",
            lastName: "Doe"
          }

          person.fullName.call(person1); // "John Doe"
          person.fullName.call(person2); // "Mary Doe"

Test Code Online

The call() Method with Arguments

The call() method can accept arguments

					 
        
          const person = {
            fullName: function(city, country) {
              return this.firstName + " " + this.lastName + "," + city + "," + country;
            }
          }

          const person1 = {
            firstName:"John",
            lastName: "Doe"
          }

          person.fullName.call(person1, "Oslo", "Norway"); // John Doe,Oslo,Norway

Test Code Online

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