What does absolute sign mean in Ruby?

Question

For example

func(@param) do |f|
    some code here
end

and

@param.each do |sth|
    some code here
end

What does the absolute value sign do here? I don't understand these two pieces of code.

Answer 1

It's the local variable within the block, so for the line:

@param.each do |sth|

you're iterating over @param right, well each item in @param is referred to singularly as sth.

So if @param refers to an array containing the numbers

[1,3,5,4]

During the first iteration sth will be 1, then 3, then 5, then 4.

Same goes for :

func(@param) do |f|

except now the local variable is called f! You could call it anything you want, even |ihavenoideawhatimdoing|