Array And Function MCQ question and answer in javascript with solution Page-2 section-1

6.

Consider the following code snippet :

var a = [1,2,3,4,5];
a.slice(0,3);

What is the possible output for the above code snippet ?

A. Returns [1,2,3]

B. Returns [4,5]

C. Returns [1,2,3,4]

D. Returns [1,2,3,4,5]

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7.

Consider the following code snippet :

var a = []; 
a.unshift(1); 
a.unshift(22);
a.shift(); 
a.unshift(3,[4,5]); 
a.shift(); 
a.shift();
a.shift();

The final output for the shift() is

A. 1

B. [4,5]

C. [3,4,5]

D. Exception is thrown

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8.
The primary purpose of the array map() function is that it

A. maps the elements of another array into itself

B. passes each element of the array and returns the necessary mapped elements

C. passes each element of the array on which it is invoked to the function you specify, and returns an array containing the values returned by that function

D. None of the mentioned

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9.
The reduce and reduceRight methods follow a common operation called

A. filter and fold

B. inject and fold

C. finger and fold

D. fold

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10.
The method or operator used to identify the array is

A. isarrayType()

B. ==

C. ===

D. typeof

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6.
Consider the following code snippet :
`var a = [1,2,3,4,5]; a.slice(0,3);`
What is the possible output for the above code snippet ?

Answer & Solution

7.
Consider the following code snippet :
`var a = []; a.unshift(1); a.unshift(22); a.shift(); a.unshift(3,[4,5]); a.shift(); a.shift(); a.shift();`
The final output for the shift() is

Answer & Solution

8.
The primary purpose of the array map() function is that it

Answer & Solution

9.
The reduce and reduceRight methods follow a common operation called

Answer & Solution

10.
The method or operator used to identify the array is

Answer & Solution

Array And Function MCQ question and answer in javascript with solution

6. Consider the following code snippet : var a = [1,2,3,4,5]; a.slice(0,3); What is the possible output for the above code snippet ?

Answer & Solution

7. Consider the following code snippet : var a = []; a.unshift(1); a.unshift(22); a.shift(); a.unshift(3,[4,5]); a.shift(); a.shift(); a.shift(); The final output for the shift() is

Answer & Solution

8. The primary purpose of the array map() function is that it

Answer & Solution

9. The reduce and reduceRight methods follow a common operation called

Answer & Solution

10. The method or operator used to identify the array is

Answer & Solution

6.
Consider the following code snippet :
`var a = [1,2,3,4,5]; a.slice(0,3);`
What is the possible output for the above code snippet ?

7.
Consider the following code snippet :
`var a = []; a.unshift(1); a.unshift(22); a.shift(); a.unshift(3,[4,5]); a.shift(); a.shift(); a.shift();`
The final output for the shift() is

8.
The primary purpose of the array map() function is that it

9.
The reduce and reduceRight methods follow a common operation called

10.
The method or operator used to identify the array is