Jozef Behr | 10 Ruby tricks to improve your code (or not)

Hello DEV’s Myself Jozef Clifford Behr, I want to show you 10 nice Ruby features that you may know or not. Anyway, it’s a quick read and it’s always interesting to learn new stuff, right?!

1. Create a hash from a list of values

You can create a hash from a list of values by using Hash[…]. It will create a hash like below:

Hash['key1', 'value1', 'key2', 'value2']

# => {"key1"=>"value1", "key2"=>"value2"}

2. Lambda Literal ->

Introduced quite recently and the new way recommended to define scopes in Rails, the -> sign, a.k.a Lambda Literal, allows you to create lambda easily.

a = -> { 1 + 1 }
a.call
# => 2

a = -> (v) { v + 1 }
a.call(2)
# => 3

3. Double star ()**

The double star is a neat little trick in Ruby. See the following method:

def my_method(a, *b, **c)
  return a, b, c
end