RUBY CHEATSHEET

RULE #1 - WE DON'T TALK ABOUT i++

RULE #2 - WE DON'T TALK ABOUT i++

CASTING METHODS

• .to_i - Casts to int by dropping anything after decimal point from a float, no rounding
• .to_f - Casts to float
• .to_s - Casts to string
• .to_sym - Casts to symbol

STRING CONCATENATION && SUBSTRINGS

• Use +, << or .concat() to concatenate strings
• "hello"[0..1] # => "he"
• "hello"[0, 4] # => "hell"
• "hello"[-1] # => "o"`

ESCAPE CHARACTERS

\\ #=> backslash
\b #=> backspace
\r #=> carriage return
\n #=> newline
\s #=> space
\t #=> tab
\" #=> double quotation
\' #=> single quotation

STRING INTERPOLATION - STRING PLACEHOLDERS FOR VARIABLES

name = "Mark"
puts "Oh, hi #{name}!" #=> "Oh, hi Mark!"
puts 'Oh, hi #{name}!' #=> "Oh, hi #{name}!"

• Must use double quotation marks for string interpolation to work!