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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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

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

4) Consider the following code snippet

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

5) Consider the following code snippet :

 if (!a[i]) continue;

What is the observation made ?

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