Test Your JavaScript Skills : ES14 - 32

Introduction

Namaste, In this blog I will discuss 10 code scenarios on Javascript .

1. Identify the output of the below program

    let arr=[11,2];
    let arr2= arr.toSorted();
    console.log(arr);
   

   a.[11,2]

   b.[2,11]

   c.error

   d.11

   e.2

   Answer:a

   Reason:The host array is not sorted.

2. Identify the output of the below program

    let arr=[11,2];
    let arr2= arr.toReversed();
    console.log(arr2);
   

   a.[11,2]

   b.[2,11]

   c.[1,12]

   d.error

   e.no output

   Answer:b

   Reason:The reversed array is returned.

3. Identify the output of the below program

    let arr=["ram","Hari"];
    let arr2= arr.toReversed();
    console.log(arr);
   

   a.["Hari","ram"]

   b.error

   c.["ram", "Hari"]

   d.no output

   e.Hari

   Answer:c

   Reason:The host array is not reversed

4. Identify the output of the below program

    let arr=[11,2];
    let arr2= arr.toReversed();
    console.log(arr);
   

   a.error

   b.[2,11]

   c.no output

   d.[11,2]

   e.11

   Answer:d

   Reason:The host array is not reversed

5. Identify the output of the below program

    let arr=[11,2];
    let arr2= arr.toSorted();
    console.log(arr2);
   

   a.[11,2]

   b.[2.11]

   c.11

   d.error

   e.2

   Answer:a

   Reason:The sorting is string based.

6. Identify the output of the below program

    let arr=[20,10,30];
    let arr2= arr.toSorted((a,b)=> a-b);
    console.log(arr2);
   

   a.[30,20,10]

   b.[10,30,20]

   c.[10,20,30]

   d.error

   e.[30,10,20]

   Answer:c

   Reason:The sorting is done using predicate.

7. Identify the output of the below program

    let arr=["ram","Hari"];
    let arr2= arr.toSorted();
    console.log(arr2);
   

   a.["ram","Hari"]

   b.error

   c.no output

   d.["Hari", "ram"]

   e.ram

   Answer: d

   Reason: The sorting is string based i.e based on ASCII value.

8. Identify the output of the below program

    let arr=["ram",2,"Hari"];
    let arr2= arr.toSorted();
    console.log(arr2);
   

   a.[2,'Hari','ram']

   b.['ram',2,'Hari']

   c.['ram','Hari']

   d.error

   e.no output

   Answer:a

   Reason:The sorting is string based i.e based on ASCII value.

9. Identify the output of the below program

    let arr=[20,10,30];
    let arr2= arr.toSorted((a,b)=> b-a);
    console.log(arr2);
   

   a.[10,20,30]

   b.[10,30,20]

   c.[30,20,10]

   d.error

   e.[30,10,20]

   Answer:c

   Reason:The sorting is done using predicate.

10. Identify the output of the below program

    let arr=[20,,30];
    let arr2= arr.toSorted((a,b)=> a-b);
    console.log(arr2);
    

    a.[20,30]

    b.[20,30,null]

    c.[20,30,undefined]

    d.[20,undefined,30]

    e.error

    Answer:c

    Reason:The empty value is converted to undefined and the array is sorted using predicate.