Ruby syntax notes, ruby syntax

Ruby syntax notes, ruby syntax

Accept user input

first_name = gets.chomp

Uppercase letters

first_name.capitalize!

Uppercase letters

first_name.upcase!

Lower letters

first_name.downcase!

Multi-row output

Print <EOF # multiline output EOF

Note

# I am a comment

Variable acquisition

#{first_name}

Variable

1. Global variable $
2. Class variable @@
3. Method variable @
4. Local variables are lowercase letters or _
   

If/else

if a < b  puts '1'elsif b < a  puts '2'end    

Class

class Classname  def functionname(params)    puts params  endendclass1 = Classname.newclass1.functionname('1')unlessunless false  print 'ok'else  print 'no'end    

Contain characters

print 'puts'user_input = gets.chompuser_input.downcase!if user_input.include?"s"  print 'has s'end

Replacement character

# s -> thuser_input.gsub!(/s/,"th")

Output variable values in strings

puts 'okok #{user_input}'

While

counter = 1while counter < 11  puts counter  counter = counter + 1end

Until

counter = 1until counter > 10  print counter  counter = counter + 1end  

+ =,-=, * =,/=
Some languages ages have the increment operators ++ and -- (which also add or subtract 1 from a value), but Ruby does not
For Loop
# If 1... 10 contains 1-9, if 1. 10 contains 1-10

for num in 1...10  puts numend  

Loop Method
An iterator is just a Ruby method that repeatedly invokes a block of code.

i = 20loop do  i -= 1  print "#{ i }"  break if i <= 0end  

Next

i = 20loop do i -= 1 next if i%2 != 0 print "#{i}" break if i <= 0end

Array

my_array = [1,2,3,4,5]

The. each Iterator

numbers = [1, 2, 3, 4, 5]# one way to loopnumbers.each { |item| puts item }# another way to loopnumbers.each do |item| puts itemend

The. times Iterator number Iterator

10.times { print 'ok'})

Looping with 'with'

num = 1while num <= 50 do  print num  num += 1end  

Looping with 'until'

num = 1until num > 50 do  print num  num += 1end  

Loop the Loop with Loop

num = 0loop do  num += 1  print "Ruby!"  break if num == 30end  

The. split Method,

text.split(",")puts "Text to search through: "text = gets.chompputs "Word to redact"redact = gets.chompwords = text.split(" ")words.each do |word|  print wordend

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