best ruby cheat sheet
def greeting(hello, *names) # *name is a splat argument, takes several parameters passed in an array
return "#{hello}, #{names}"
end
start = greeting("Hi", "Justin", "Maria", "Herbert") # call a method by name
def name(variable=default)
### The last line in here get's returned by default
endbest ruby cheat sheet
hash = { "key1" => "value1", "key2" => "value2" } # same as objects in JavaScript
hash = { key1: "value1", key2: "value2" } # the same hash using symbols instead of strings
my_hash = Hash.new # same as my_hash = {} – set a new key like so: pets["Stevie"] = "cat"
pets["key1"] # value1
pets["Stevie"] # cat
my_hash = Hash.new("default value")
hash.select{ |key, value| value > 3 } # selects all keys in hash that have a value greater than 3
hash.each_key { |k| print k, " " } # ==> key1 key2
hash.each_value { |v| print v } # ==> value1value2
my_hash.each_value { |v| print v, " " }
# ==> 1 2 3best ruby cheat sheet
=begin
Bla
Multyline comment
=endbest ruby cheat sheet
for i in 1..5
next if i % 2 == 0 # If the remainder of i / 2 is zero, we go to the next iteration of the loop.
print i
endbest ruby cheat sheet
unless false # unless checks if the statement is false (opposite to if).
puts “I’m here”
else
puts “not here”
end
# or
puts "not printed" unless truebest ruby cheat sheet
i = 0
loop do
i += 1
print "I'm currently number #{i}” # a way to have ruby code in a string
break if i > 5
endbest ruby cheat sheet
"Hello".length # 5
"Hello".reverse # “olleH”
"Hello".upcase # “HELLO”
"Hello".downcase # “hello”
"hello".capitalize # “Hello”
"Hello".include? "i" # equals to false because there is no i in Hello
"Hello".gsub!(/e/, "o") # Hollo
"1".to_i # transform string to integer –– 1
"test".to_sym # converts to :test
"test".intern # :test
:test.to_s # converts to "test"best ruby cheat sheet
10.times do
print “this text will appear 10 times”
endbest ruby cheat sheet
i = 0
until i == 6
puts i
i += 1
endbest ruby cheat sheet
my_array = [a,b,c,d,e]
my_array[1] # b
my_array[2..-1] # c , d , e
multi_d = [[0,1],[0,1]]
[1, 2, 3] << 4 # [1, 2, 3, 4] same as [1, 2, 3].push(4)Copyright © 2021 Codeinu
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