The pop() method of the array does which of the following task ?
Home | Discussion ForumThe 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
Answer : A
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1) Consider the following code snippet
var a1 = [,,,];
The result would be
var a2 = new Array(3);
0 in a1
0 in a2
2) 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
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3) The reduce and reduceRight methods follow a common operation called
4) 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
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5) 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