Consider the following code snippet :<br/><pre> var a = [];<br/> a.unshift(1);<br/> a.unshift(22);<br/> a.shift();<b

Consider the following code snippet :

  var a = [];
  a.unshift(1);

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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

1

[4,5].

[3,4,5].

Exception is thrown

Answer : A

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

maps the elements of another array into itself

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

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

None of the mentioned

View Answer

2) The pop() method of the array does which of the following task ?

decrements the total length by 1

increments the total length by 1

prints the first element but no effect on the length

None of the mentioned

View Answer

3) 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

1

[4,5].

[3,4,5].

Exception is thrown

View Answer

4) Consider the following code snippet

  var a1 = [,,,];
  var a2 = new Array(3);
  0 in a1
  0 in a2

The result would be

true false

false true

true true

false true

View Answer

5) Consider the following code snippet :

 if (!a[i]) continue;

What is the observation made ?

Skips the undefined elements

Skips the non existent elements

Skips the null elements

All of the mentioned

View Answer

Javascript MCQ - English

GK in Hindi

Consider the following code snippet :
var a = [];
a.unshift(1);

MCQ Category

Javascript MCQ - English

GK in Hindi

Consider the following code snippet : var a = []; a.unshift(1);

MCQ Category

Consider the following code snippet :
var a = [];
a.unshift(1);