Array and String Manipulation Mastery Quiz Quiz

1. Finding Duplicates in Arrays

   Given the array [3, 1, 4, 1, 5], which number is a duplicate?

   1. 1
   2. 3
   3. 4
   4. 5
   5. None

2. Reversing a String

   What is the result of reversing the string 'array'?

   1. yarrA
   2. yarra
   3. arraY
   4. yaray
   5. array

3. Searching for an Element

   Which JavaScript method returns the first index at which a given element can be found in an array?

   1. indexOf
   2. findIndexOf
   3. getIndex
   4. search
   5. findPosition

4. Splitting Strings

   What does 'hello,world'.split(',') return?

5. Joining Array Elements

   If arr = ['a', 'b', 'c'], what does arr.join('-') return?

   1. a-b-c
   2. abc
   3. a,b,c
   4. a b c
   5. a-b,c

6. Case Transformation

   What is the output of 'MiXeD'.toLowerCase()?

   1. mixed
   2. MIXED
   3. MixEd
   4. MiXeD
   5. mIxEd

7. Removing the Last Array Element

   Which array method removes the last element from an array?

   1. pop
   2. push
   3. shift
   4. splice
   5. removeLast

8. Finding the Length

   What is the value of ['apple', 'banana', 'orange'].length?

   1. 3
   2. 2
   3. 1
   4. 4
   5. 0

9. Array to String Conversion

   What does ['2024', 'quiz'].toString() return?

   1. 2024,quiz
   2. 2024quiz
   3. ['2024','quiz']
   4. 2024:quiz
   5. 2024 quiz

10. Checking Presence in String

    What does 'banana'.includes('nan') return?

    1. true
    2. false
    3. null
    4. undefined
    5. NaN