The reduce and reduceRight methods follow a common operation called

The reduce and reduceRight methods follow a common operation called

filter and fold

inject and fold

finger and fold

fold

Answer : B

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1) The reduce and reduceRight methods follow a common operation called

2) 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

[4,5].

[3,4,5].

Exception is thrown

3) What will happen if reverse() and join() methods are used simultaneously ?

Reverses and stores in the same array

Reverses and concatenates the elements of the array

Reverses

All of the mentioned

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

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