Ruby Grammar Notes _ruby topics

Accept user Input

First_Name = Gets.chomp

Capitalize first letter

first_name.capitalize!

Uppercase letters

first_name.upcase!

The letter becomes lowercase

first_name.downcase!

Multi-line output

Print <<eof
  # Multiline output
EOF

Comments

# I'm a note

Variable fetch

#{first_name}

Variable

1. Global variable $
2. Class variable @@
3. Method variable @
4. local variable lowercase letter or _
   

If/else

If a < b
  puts ' 1 '
elsif B < A
  puts ' 2 '
end    

Class

Class Classname
  def functionname (params)
    puts params end Class1

=
classname.new Class1.functionname (' 1 ')
unless
unless false
  print ' OK '
else
  print ' No '
end    

Whether to include characters

print ' puts '

user_input = gets.chomp

user_input.downcase!

If User_input.include? " S "
  print ' has s '
end

Substitution character

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

To output a variable value in a string

Puts ' Okok #{user_input} '

While

Counter = 1 while

counter < One
  puts counter
  counter = counter + 1
End

Until

Counter = 1
until counter >
  Print counter
  counter = counter + 1
End 
 

+ =, = =, *=,/=
Some languages 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 Num
end  

Loop method
An iterator was just a Ruby method this repeatedly invokes a block of code.

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

Next

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

Array

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

The. Each iterator iterator

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

# One way to loop
Numbers.each {|item| puts item}

# Another way to loop
Nu Mbers.each do |item|
 Puts item end

The. Times iterator iterator

10.times {print ' OK '})

Looping with ' while '

num = 1 while

num <= does
  print num =
  1
End  

Looping with ' Until '

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

Loop the loop with loop

num = 0

loop do
  num + + 1
  print "ruby!"
  break if num = =
  

The. Split method,

Text.split (",")

puts "text to search through:"
text = Gets.chomp
puts "Word to redact"
redact = gets.ch Omp

words = Text.split ("")

Words.each do |word|
  Print Word End