JavaScript Function call() Method

by Online Tutorials Library July 22, 2022

JavaScript Function call() method

The JavaScript Function call() method is used to call a function contains this value and an argument provided individually. Unlike apply() method, it accepts the argument list.

Syntax

Parameter

thisArg – It is optional. The this value is given for the call to function.

arg1,arg2,…,argn – It is optional. It represents the arguments for the function.

Return Value

It returns the result of the calling function along provided this value and arguments.

JavaScript Function call() method Example

Example 1

Let’s see a simple example of call() method.

  <script>  function Emp(id,name) {    this.id = id;    this.name = name;  }  function PermanentEmp(id,name) {   Emp.call(this,id,name);  }  document.writeln(new PermanentEmp(101,”John Martin”).name);  </script>  

Test it Now

Output:

John Martin

Example 2

Let’s see an example of call() method.

  <script>  function Emp(id,name) {    this.id = id;    this.name = name;  }  function PermanentEmp(id,name) {   Emp.call(this,id,name);  }  function TemporaryEmp(id,name) {   Emp.call(this,id,name);  }  var p_emp=new PermanentEmp(101,”John Martin”);  var t_emp=new TemporaryEmp(201,”Duke William”)  document.writeln(p_emp.id+” “+p_emp.name+”<br>”);  document.writeln(t_emp.id+” “+t_emp.name);</script>  

Test it Now

Output:

101 John Martin  201 Duke William

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