Blocks

• one or more lines of code that you put inside the do and end keywords.
• or { and } for inline blocks.
• We can pass one or more variables into the block.

do

puts "this is a test"

end

• But block doesn't run by itself.
• We need to attach it with something.

Multi-line

# n ==> Block parameter.

[0, 1, 2, 3, 4].each do |n|

puts "Number #{n}"

end

Single-line with do-end

[0, 1, 2, 3, 4].each do |n| puts "Number #{n}" end

Single-line with { }

# Single line with { }

[0, 1, 2, 3, 4].each { |n| puts "Number #{n}" }

• If we look above, do and end is literally replaced with { and }.