iteration: cheat sheet

Let’s talk about some iterators for ruby.
.each
.map or .collect
.select
.find

# .each
`.each` is probably one of the most used iterations I use in my code to make the code work ‘with’ something instead of ‘to.’

[1, 2, 3, 4, 5].each do |element|
puts element
end


#=> 1
2
3
4
5

# .map or .collect
`.map` or `.collect` essentially do the same things — can return a new array with the same length as the original array given.

[1, 2, 3, 4, 5].map do |element|
element + 1
end


#=> [2, 3, 4, 5, 6]

# .select
`.select` is based off your stipulations. For example:

[1, 2, 3, 4, 5].select do |element|
element < 3
end

#=> [1, 2]


# .find
`.find` returns the first element in the array that meets the criteria

[1, 2, 3, 4, 5].find do |element|
element.even?
end


#=> 2