Discover Ruby Programming Through Fun Examples/

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Key Highlights

Key Highlights

A quick summary of the core Ruby syntax used in our code examples.

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Print out

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# print out text
puts "a" + "b";  	# => "ab"
puts 1 + 2;    		# => 3
puts "1" + "2";		# => "12"
# print out without new line after
print "Hi"
print "Bob"  
# the screen output will be "HiBob"
# print out joined multiple strings
print "Bye", " John"    # => "Bye John"

Variable assignment

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total = 1 + 2 + 3;  # => total has value: 6
average = total / 3;
puts average;		# => 2
## print string with variable
puts "total is " + total.to_s
puts "average is #{average}"

Read user input

puts "type 'Hi'"
input = gets	 # => type "Hi"
puts input  	 # => "Hi\n"

## normally strip off the new line "\n"
input = gets.chomp  # => "Hi"

## read an integer
print "Enter a number"
num = gets.chomp.to_i
Getting input from user and converting it to an integer

Conditional

Two boolean values—true and false

Use of if

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score = -70
if score < 0
  puts score = 0  # no negative score
end

Use of unless

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score =  -70
unless score >= 0
  puts score = 0  # no negative score
end

Single line

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