ruby_notes.md

You don’t need to specify int, string, etc. Just assign a variable using numbers, boolean or "". (but you can using Integer(gets.chomp) for example!)

my_num = 1 , my_bool = true , my_string = "string"

print prints to the console, puts prints to the console with a new line.

There is a difference between " and '! " allows string interpolation.

You can call methods on strings without it needing to be an assigned variable. e.g. "this is a cool string".length

.reverse returns

You don’t always need brackets, although it still compiles with them. e.g.

puts "name".upcase    # ==> NAME

puts("name".upcase)   # ==> NAME

Comments:

# this is a single line comment

=begin
this is a multi-line comment
=end

.capitalise sets the first character to upper case and the rest to lower case.

Adding ! to the end of a method call makes the variable equal the output. e.g.

name.capitalize! makes name = name.capitalize

gets takes an input from the terminal.

.chomp removes new lines.

Instead of if !this Ruby uses unless

unless hungry
	# do this if hungry is false (do this unless it is true)
else
  # do this if hungry is true
end

Lines that end with ? result in booleans. e.g.

if string.include? "character"

gsub substitutes a character.

Ruby has no ++, use += 1 instead.

for loops in a range utilise .. and .... .. means between x..y, including y. ... means between x...y, not including y.

for num in 1..20
  puts num
end
# prints numbers 1 - 20, including 20.

To iterate through an object like an array, use .each.

Symbols are variables that are immutable and only exist in one place (one storage bit thing). Use them with : two: is a symbol called two. They are often used for hash keys or referencing method names.

Use .to_sym / .intern and .to_s to swap them between strings and symbols.

From this lesson. CRUD!