Ruby

Sources: https://www.ruby-lang.org/en/, 1,

RUBY : A dynamic, open source programming language with a focus on simplicity and productivity. It has an elegant syntax that is natural to read and easy to write.

Installation :

1. Download
2. Extract
3. cd to bin
4. ./irb #to get Interactive Ruby Shell

OR,

1. yum install ruby ruby-irb #On CentOS
2. irb

#statement separator :

; Or new line

#Comment

#is the comment line and will be ignored by ruby interpreter

#variable assignment-

a="This is a test. "

b=10

c = "Some text"

#print/display

puts "Hello World"

#string placeholders is #{}.

puts "#{a} #{b}" #double Quotes is must.

#String Concatenation

puts a + c #is right as both are strings

puts a + b #is wrong and results in error (TypeError: can't convert Fixnum into String) as b is integer & a is string

#For Loop

for i in 0..10

puts "Hello #{i}"

end

#play with array in irb

[4,5,2,9,1].max

=> 9

-------------------------------------------

[4,5,2,9,1].min

=> 1

-------------------------------------------

[4,5,2,9,1].sort

=> [1, 2, 4, 5, 9]

-------------------------------------------

[4,5,2,9,1].reverse

=> [1, 9, 2, 5, 4]

-------------------------------------------

[4,5,2,9,1].sort.reverse

=> [9, 5, 4, 2, 1]

-------------------------------------------

for i in [4,5,2,9,1]

puts i * i

end

16

25

4

81

1

=> [4, 5, 2, 9, 1]

-------------------------------------------

#calculate in irb

1+2+3+4+5

=> 15

1+2*3

=> 7

1+2*3/3

=> 3

1+2*3/3+(5-4)

=> 4

Example: ruby_example_1.7z