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#Message passing
puts "the ruby language".length
puts "Ruby".index("y")
puts -6.abs
puts 10.49.round
puts 10.50.round
puts 2.next
puts 99.chr
puts
#Variables and Aliasing
person1 = "Tommy"
person2 = person1
#assigning person1 to person2 does not create an new objet. Both refer to the same object.
puts person1
puts person2
puts
#To void aliasing, and create new object with same content use dup.
person3 = person1.dup
person1[0] = "R"
puts person1
puts person2
puts person3 #new object
puts
#Chaining assignment statements
#assignment sets variable on left to experssion on right.
a = b = 1 + 2 + 3
puts a
puts b
puts
a = (b = 1 + 2) + 3
puts a
puts b
puts
#Parallel assigment
a = 1
b = 2
a,b = b,a
puts a
puts b
puts
x = 0
a, b, c = x, (x += 1), (x +=1)
puts a # x = 0
puts b # x = 0 + 1 now x = 1
puts c # x = 1 + 1 now x = 2
puts x # x = 2
puts
#Arrays
#using literals : list of objects between brackets
#arrays can hold objects of different types
a = ["number",1,2,3.14]
puts a
puts a.length
puts a[0]
a[3] = nil
puts a
puts
#Array object
#Ruby allows array range specification
myarray = [1,2,3,4,5,6]
puts myarray[0] #1
puts
puts myarray[1,3] #i to j,including j
puts
puts myarray[1...3] #i to j,excluding j
puts
puts myarray[1..3] #i to j,including j
puts
#Negative index allowed
a = ["pi", 3.14, "prime",17]
puts a.class
puts a[-1] #count from end of array
puts a[3]
puts a[-2]
puts a[2]
puts a[1]
puts a[0]
puts
b = Array.new
puts b.class
puts b.length
b[0] = "a"
b[1] = "new"
puts b.length
puts b
puts
#Associative Arrays (Hash)
#undordered collection of elements
#element is a pair of two objects:
#value and key:
#hashName = { "key" => "value",...}
biblio = { "hello" => "No",
"Salut" => "Yes",
"Tell me the gossip fam" => "maybe" }
puts biblio.length
#To retreive the value of a key:
#["key"] = value
puts biblio["hello"]
biblio["Tell me the gossip fam"] = "ok"
puts biblio["Tell me the gossip fam"]
puts
#Add to the collection
biblio["Someone is in love"] = "yas"
puts biblio["Someone is in love"]
puts biblio.length
#Delete an element
biblio.delete_if{|key, value| key == "hello"}
puts biblio.length
puts
#Iterate over an associative array
biblio.each_pair do |key,value|
puts "#{key} : #{value}"
end
puts
#Same output different way
biblio.each { |key, value| puts key + " : " + value}
puts
#Iterate over collection and access and disply each key individually
biblio.each_key {|key| puts key}
# Hello World Program in Ruby
puts "Hello World!";
# Hello World Program in Ruby
students = Hash.new("students")
students = ["id"=>"283560", "name"=>"shravan", "course"=>"Technology"]
students.each do |key, value|
print key, value
end
a=[0,1,2,3,4,5,6,7,8,9,10]
puts "enter a number in the range 1-10"
num=8
sum=0
b=[]
a.each do |i|
a.each do |j|
sum=i+j
if sum==num
b << i
b << j
print b
b.clear
end
end
end
def viginere(string)
countArr = []
count=0
newString=[]
for i in 1..string.length-1 do
for x in i..string.length do
newString.push(string[x])
end
for y in 0..newString.length do
if string[y] == newString[y]
count = count + 1
end
end
countArr.push([i, count])
count=0
newString=[]
end
countArr = countArr.sort {|x,y| y[1] <=> x[1] }
mods = []
for x in 0..20 do
mods.push([x+2,0])
for i in 0..9 do
if countArr[i][0]%(x+2) == 0
mods[x][1]=mods[x][1]+1
end
end
end
mods = mods.sort {|x,y| y[1] <=> x[1] }
return mods
end
def encrypt(string, key)
result = []
i = 0
for x in 0..string.length-1 do
pass_char = key[i]
xor = string[x].ord ^ pass_char.ord
result.push(xor)
i+=1
if i == (key.size)
i = 0
end
end
return result
end
password = ["J","O","N"]
input = "had i the heavens embroidered cloths enwrought with golden and silver light the blue and the dim and the dark cloths of night and light and the half light i would spread the cloths under your feet but i being poor have only my dreams i have spread my dreams under your feet tread softly because you tread on my dreams"
newText = encrypt(input, password)
result = viginere(newText)
for x in 0..result.length-1 do
puts result[x][0].to_s + ": " + result[x][1].to_s + " matches"
end
