JavaScript Questions & Answers – Defining and Invoking Functions

This set of Javascript Multiple Choice Questions & Answers (MCQs) focuses on “Defining and Invoking Functions”.

1. The function definitions in JavaScript begins with
a) Identifier and Parentheses
b) Return type and Identifier
c) Return type, Function keyword, Identifier and Parentheses
d) Identifier and Return type
View Answer

2. Consider the following code snippet

function printprops(o) 
{
    for(var p in o)
      console.log(p + ": " + o[p] + "\n");
}

What will the above code snippet result ?
a) Prints the contents of each property of o
b) Returns undefined
c) prints only one property
d) prints the address of elements
View Answer

3. When does the function name become optional in JavaScript?
a) When the function is defined as a looping statement
b) When the function is defined as expressions
c) When the function is predefined
d) when the function is called
View Answer

4. What is the purpose of a return statement in a function?
a) Returns the value and continues executing rest of the statements, if any
b) Returns the value and stops the program
c) Returns the value and stops executing the function
d) Stops executing the function and returns the value
View Answer

5. What will happen if a return statement does not have an associated expression?
a) It returns the value 0
b) It will throw an exception
c) It returns the undefined value
d) It will throw an error
View Answer

6. A function with no return value is called
a) Procedures
b) Method
c) Static function
d) Dynamic function
View Answer

7. The function stops its execution when it encounters?
a) continue statement
b) break statement
c) goto statement
d) return statement
View Answer

8. Which keyword is used to define the function in javascript?
a) void
b) int
c) function
d) main
View Answer

9. Which is an equivalent code to invoke a function m of class o that expects two arguments x and y?
a) o(x,y);
b) o.m(x) && o.m(y);
c) m(x,y);
d) o.m(x,y);
View Answer

10. Consider the following code snippet

o.m(x,y);

Which is an equivalent code for the above code snippet?
a) o.m(x) && o.m(y);
b) o[“m”](x,y);
c) o(m)[“x”,”y”];
d) o.m(x && y);
View Answer

11. What will be the output of the following Javascript code?

function info()
{  
    int a=1;
    int b=2;
    return a*b;  
}  
document.write(info());

a) 1
b) 2
c) 3
d) error
View Answer

12. What will be the output of the following Javascript code?

var arr = [7, 5, 9, 1];  
var value = Math.max.apply(null, arr);  
document.writeln(value);

a) 7
b) 5
c) 1
d) 9
View Answer

13. What will be the output of the following Javascript code?

var person = 
{  
      name: “Rahul”,  
      getName: function() 
      {  
          nreturn this.name;  
      }  
} 
var unboundName = person.getName;  
var boundName = unboundName.bind(person);  
document.writeln(boundName());

a) runtime error;
b) compilation error
c) Rahul
d) undefined
View Answer

14. What will be the output of the following Javascript code?

function code(id,name) 
{  
  		this.id = id;   
  		this.name = name;  
}  
function pcode(id,name) 
{  
 		code.call(this,id,name);  
}
 
document.writeln(new pcode(101,"vivek").id);

a) vivek
b) 101
c) Runtime error
d) Compilation error
View Answer

15. What will be the output of the following Javascript code?

     var pow=new Function("num1","num2","return Math.pow(num1,num2)");  
     document.writeln(pow(2,3));

a) 2
b) 3
c) 8
d) error
View Answer

Sanfoundry Global Education & Learning Series – Javascript Programming.