Test Your JavaScript Skills : ES8/ES7 (JavaScript 2017/16) - 46

Introduction

Namaste, In this blog I will discuss 12 code scenarios on Javascript .

1. Identify the output of the below program

    let city = {
        "delhi":1000,
     };
    let obj = Object.getOwnPropertyDescriptors(city);
    console.log(obj.delhi.configurable);
   

   a.false

   b.true

   c.delhi

   d.error

   e.1000

   Answer:b

   Reason:The configurable is true for the current property.

2. Identify the output of the below program

    let city = {
        "delhi":1000,
     };
    let obj = Object.getOwnPropertyDescriptors(city);
    console.log(obj.delhi.writable);
   

   a.true

   b.false

   c.delhi

   d.error

   e.1000

   Answer:a

   Reason:The writeable is true for the current property.

3. Identify the output of the below program

    console.log("ram".padStart(4,0));
   

   a.0ram

   b.0000am

   c.ram

   d.error

   e.undefined

   Answer:a

   Reason:The padding is done at start with 0 where the size is 4 characters.

4. Identify the output of the below program

    console.log("ram".padEnd(5,0));
   

   a.ram00000

   b.ram0000

   c.ram00

   d.undefined

   e.error

   Answer:c

   Reason:The padding is done at end with 0 where the size is 5 characters.

5. Identify the output of the below program

    console.log("ram".padStart(3,0));
   

   a.ram

   b.000ram

   c.0ram

   d.ram0

   e.undefined

   Answer:a

   Reason:The output is ram.

6. Identify the output of the below program

    let a=10;
    let b=3;
    let c = a**b;
    console.log(c);
   

   a.30

   b.100

   c.1000

   d.error

   e.10

   Answer:c

   Reason:By exponent computation the result is 1000.

7. Identify the output of the below program

    let names = ["ram","hari","gopi","ramesh"];
    console.log(names.includes("mahesh"));
   

   a.true

   b.false

   c.0

   d.5

   e.undefined

   Answer:b

   Reason:The string Mahesh is not found in names array.

8. Identify the output of the below program

    let names = ["ram","hari","gopi","ramesh"];
    console.log(names.includes("ramesh"));
   

   a.0

   b.3

   c.undefined

   d.false

   e.true

   Answer:e

   Reason:The string ramesh exists in names array.

9. Identify the output of the below program

    let city = {
        "delhi":1000,
     };
    let obj = Object.getOwnPropertyDescriptors(city);
    console.log(obj.delhi.key);
   

   a.delhi

   b.1000

   c.undefined

   d.error

   e.true

   Answer:c

   Reason:The key is undefined for the current property.

10. Identify the output of the below program

    let city = {
        "delhi":1000,
     };
    let obj = Object.getOwnPropertyDescriptors(city);
    console.log(obj.delhi.value);
    

    a.delhi

    b.true

    c.false

    d.1000

    e.error

    Answer:d

    Reason:The value of the current property is 1000.

11. Identify the output of the below program

    let  cities = ['Bangalore', 'Mumbai', 'Hubli', 'Mysore','Pune', 'Kolkata'];
    console.log(cities.includes('Hubli', 4));
    

    a.0

    b.2

    c.undefined

    d.false

    e.true

    Answer:d

    Reason:The string hubli exists before index 4 in array cities.

12. Identify the output of the below program

    let  cities = ['Bangalore', 'Mumbai', 'Hubli', 'Mysore','Pune', 'Kolkata'];
    console.log(cities.includes('Pune', 4));
    

    a.0

    b.2

    c.undefined

    d.false

    e.true

    Answer:e

    Reason:The string Pune exists at index 4 in array cities.