Syntax
def square(number)
number * number
end
[1, 2, 3].map { |n| square(n) }Examples
Transforming an array
A small, runnable example of this syntax.
def square(number)
number * number
end
results = [1, 2, 3].map { |number| square(number) }
puts results.inspect # [1, 4, 9]Best practices
- Choose descriptive block parameter names when a block has more than one step; the short form is best for genuinely simple transformations.
- Keep examples small while learning, then combine the idea with a real project.
At a glance
- Purpose
- Expressive scripting and applications
- File extension
- .rb
- Runs in
- Ruby interpreter
- Usually used with
- Ruby standard library and gems