The reduce and reduceRight methods follow a common operation called

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The reduce and reduceRight methods follow a common operation called

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1) Consider the following code snippet

  var a1 = [,,,];
var a2 = new Array(3);
0 in a1
0 in a2
The result would be

2) The method or operator used to identify the array is

3) Consider the code snippet given below

var count = [1,,3];

What is the observation made?

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

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

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