gs gs106 Lexical Structures - JavaScript Array and Related Methods - Quiz No.1
gs gs106 Javascript Quiz
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Question 1: What is the observation made in the following JavaScript code?
var count = [1,,3];
The omitted value takes “undefined”
This results in an error
This results in an exception
The omitted value takes an integer value
Question 2: What will be the output of the following JavaScript code?
var a1 = [,,,]; var a2 = new Array(3); 0 in a1 0 in a2
true false
false true
true true
false true
Question 3: 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
updates the element
Question 4: What is the observation made in the following JavaScript code?
if (!a[i]) continue;
Skips the defined elements
Skips the existent elements
Skips the null elements
Skips the defined & existent elements
Question 5: 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
Stores the elements of an array in normal order
Question 6: What will be the possible output of the following JavaScript code?
var a = [1,2,3,4,5]; a.slice(0,3);
Returns [1,2,3]
Returns [4,5]
Returns [1,2,3,4]
Returns [1,2,3,4,5]
Question 8: 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
pass the elements of the array into another array
Question 9: The reduce and reduceRight methods follow a common operation called __________
filter and fold
inject and fold
finger and fold
fold
Question 10: The method or operator used to identify the array is __________
isarrayType()
==
===
typeof
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