Test your JavaScript Skills:Fundamentals-17

Introduction

Namaste, In this blog I will discuss 7 code scenarios on Javascript fundamentals.

1. Identify the output of the below program

    let a=10;
    const a=11;
    console.log("value", a);
   

   a.10

   b.11

   c.error

   d.undefined

   e.null

   Answer:c

   Reason: There is an error because of re-declaration.

2. Identify the output of the below program

    function fx() {}
    var fx=10; 
    console.log("value", fx);
   

   a.10

   b.fx(){}

   c.undefined

   d.error

   e.null

   Answer: a

   Reason: There is no re-declaration hence fx takes the last assigned value i.e. 10.

3. Identify the output of the below program

    let fx4=1;
    function fx4(){} 
    console.log("value", fx4)
   

   a.error

   b.null

   c.undefined

   d.1

   e.fx4(){}

   Answer: a

   Reason: There is an error because of re-declaration

4. Identify the output of the below program

    var fx5=56;
    function fx5(){
        console.log("fx5");
    }
    console.log(typeof fx5);
   

   a.56

   b.function

   c.number

   d.error

   e.undefined

   Answer: c

   Reason: The typeof of fx5 is a number.

5. Identify the output of the below program

    function fx() {}
    let fx=30; 
    console.log("value", fx);
   

   a.error

   b.30

   c.fx(){}

   d.undefined

   e.null

   Answer: a

   Reason: There is an error because of re-declaration.

6. Identify the output of the below program

    var fx5;
    function fx5(){
        console.log("fx5");
    }
    console.log(typeof fx5);
   

   a. function

   b. number

   c. undefined

   d. error

   e. class

   Answer: a

   Reason: The typeof of fx5 is function.

7. Identify the output of the below program

    function fx3(){}
    const fx3=30; 
    console.log("value", fx3);
   

   a.fx3(){}

   b.30

   c.undefined

   d.error

   e.null

   Answer: d

   Reason: There is an error because of re-declaration.