Why create blocks in ruby...

Question

when you can instead create another method? Are there some situations where creating a block might be better idea than creating another method?

Brandon Barrette · Accepted Answer

You will see soon in later videos that you might yield to a block (meaning passing a block into a method), something you couldn't do with two methods. Think of a block as bits of ruby code (to be executed), rather than arguments which are values. I wouldn't be able to pass in bits of ruby code as an argument to a method. 
Read more here:
http://www.tutorialspoint.com/ruby/ruby_blocks.htm
Specifically:
```ruby
def hello
  puts "Hello"
  yield
end
hello { puts "World" }
=> Hello World
hello { puts "how are you today?"}
=> Hello how are you today?
```
You can also do:
```ruby
def hello(name, &block)
  puts "Hello #{name}"
  block.call
end
hello("World") { puts "How are you?" }
=> Hello World
=> How are you?
```
Notice here I can pass in a block, which can be useful to pass other pieces of code into a method, something you can NOT do with arguments.

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Ron Chan

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Why create blocks in ruby...

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Brandon Barrette

Brandon Barrette

lindseyk

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