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Ruby Language for Beginners, Part 2: Ruby Methods

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Ruby Language for Beginners, Part 2: Ruby Methods

We continue our series with a look at Ruby methods and variables and how developers work with these facets of the language.

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Hello!

This is a post from the Ruby Language for Beginners in 8 Parts!

  • Part 1 - Ruby Characteristics and first Ruby code

  • Part 2 - Ruby Methods and Variables

  • Part 3 - Ruby Strings

  • Part 4 - Ruby Classes, Objects, and Instances

  • Part 5 - Ruby Conditionals

  • Part 6 - Ruby Arrays

  • Part 7 - Ruby Hashes

  • Part 8 - Ruby Loops

In the today's post, we're going to look at Methods and Variables in Ruby

Ruby Methods

Let's create the following mathematical calculation:

puts 1 + 2

puts 4 + 2

puts is a Ruby method. Actually, it's a built-in Ruby method and we can create our own Ruby methods.

We could create a calculator to add numbers by creating a method called sum, receiving 2 parameters:

def sum(a, b)
  return a + b
end

puts sum(1, 2)

puts sum(4, 2)

Notice the pattern to create a Ruby method:

def your_method_name
# your awesome logic here!
end

Ruby is really smart and you don't need to use the return keyword:

def sum(a, b)
  a + b
end

Ruby evaluates the last expression and returns that!

Just remember, we don't need to use parentheses when calling a method:

puts sum 1, 2

puts sum 4, 2

Let's jump into Ruby Variables!

Ruby Variables

We need to keep values somewhere, right? 

Let's create a method to sum up 10 to a given number and then return the result:

def sum_by_ten number
  ten = 10
  sum = number + ten
  return sum
end

puts sum_by_ten 5

As you can see, we created the variable ten to hold the value 10.

Can we change the variable in the middle of the program? Yes, we can!

def sum_by_five number
  five = 5
  sum = number + five
  # changing in the middle of the game!
  five = 10
  puts five
  return sum
end

puts sum_by_five 10

The output will be:

10
15

Changing the Type of the Variable

Ruby has another important characteristic: you can change the type of the variable, even after you've initiated it.

In the previous example, we had the following Ruby code:

ten = 10
puts ten
ten = "My value 10"
puts ten

This is totally fine in Ruby!

That's it! In the next post: Part 3 - Ruby Strings we're going to look at Ruby Strings!

I hope that this will be useful to you!

Thanks!

Deploying code to production can be filled with uncertainty. Reduce the risks, and deploy earlier and more often. Download this free guide to learn more. Brought to you in partnership with Rollbar.

Topics:
ruby ,ruby objects ,web app ,ruby classes ,tutorial ,beginner

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