The call method in JavaScript is utilized to invoke a function with a specific 'this' value and individual arguments. In contrast to the apply method, call accepts arguments as a list.
Syntax
Example
function.call(thisArg, arg1,arg2,....,argn)
Parameter
The parameter thisArg is not mandatory. It represents the value of this that will be used when the function is called.
The arguments, denoted as arg1, arg2, up to argn, are optional and are used to pass values to the function.
Return Value
The return statement in programming gives back the outcome of a function call along with the specified value and parameters.
JavaScript Function call method Example
Example 1
Let's see a simple example of call method.
Example
<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>
Output:
Output
John Martin
Example 2
Let's see an example of call method.
Example
<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>
Output:
Output
101 John Martin
201 Duke William
