Arrays in ruby

Faq

Q1) How can we find if a elements is present in an array or not ?
ans: array_name.include?(element)

Q2) How to add a element at the starting of the array?
ans: array_name.unshift(element)

Q3) Initialize the array with a particular elements while creating an array?
ans: array_name=Array.new(size,initial value)

Q4) How to find the permutation of an array ?
ans: array_name.permutation("the size of permutation")

mcq

Q1) What is the correct way to create array of size 10?
a) array=Array.new()=10
b) array=Array.new(10)
c) array=Array.new()=[10]
d) None of these

ans: b) array=Array.new(10)

Q2) What will be the output of this statement :
		array1 = [[1,2,3,5],[0,0,1,0]]
		array2 = [[1,2,3,5],[0,1,0,0]]
		print array1-array2

a) [[0, 0, 1, 0]]
b) [[1, 2, 3, 5], [0, 0, 1, 0]]
c) nil
d) can't determined

ans: a)[[ 0, 0, 1, 0]]

Q3) What is the output of this statement :
		n = [ 80, 69, 80 ] 
		puts n.pack("ccc")
		
a) EPE
b) epe
c) PEP
d) pep

ans: c) PEP

Q4) What will this statements give as output :
		array = [12,13,14,15,16]
		print array[6]
		
a) Syntax error
b) Array index out of bound
c) nil
d) [nil]

ans: c)nil