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A Ruby Cheatsheet For Arrays
A reference for beginners and forgetful professionals
Simply put, before you lies a metric ton of handy Ruby Array methods. It’s long, but I tried to include all the really useful stuff. When a method is used, be sure to check the docs for more info. And to keep things shorter, I’ll write return values in comments, so arr # -> "stuff" means that the return value for arr is “stuff”.
Creating Arrays
Create a new, empty array: Array #new
arr = []
arr2 = Array.new Create a new array with values:
arr_with_stuff = ["value", "separated by comma"]
arr_with_stuff2 = Array.new(["a", "b", "c"])
range_to_arr = (1..9).to_a create an array of duplicate values: Sometimes it’s helpful to have an array filled with multiple, duplicates:
arr = Array.new(5, " ")
# -> [" ", " ", " ", " ", " "]create an array of strings with a shortcut: use the %w shortcut to create an array of strings without quotes or commas:
arr = %w(cat dog mouse 1 2)
# -> ["cat", "dog", "mouse", "1", "2"]convert a string into an array: #split will split a string into an array. It takes an argument of a string to decide where to split the…
