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Can't understand this Ruby Hashes num Code


1) what does '|num| output' mean?

this doesn't mean anything. ON the first line you declare that output is a string. the << operator append the value to a string. IN your case " RUBY#{num}" Is appendeds to the string. at the end you return the string by calling output which returns the value of the string.

2) why does the countdown number appear in the #{|num|}!?

You interpolated the value. Essentially you num represents a variable. Each time the loop runs the variable changes and the "#{}" syntax says to use the variable value.


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