I am trying to understand this standalone method for practice [closed] - ruby

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Im trying to write a standalone method named count_lines that returns the number of lines in an input string.
If i run this test code it should produce the output shown:
s = %W/This
is
a
test./
print "Number of lines: ", count_lines(s), "\n"
# Output:
Number of lines: 4
I am fairly new to Ruby and I am trying to figure out if this pseudocode of the actual output or not. Please help me!!

Answer 1

I would assume count_lines is a method that counts the number of elements in a an array, you can count the number of elements using of the several methods ruby provides look up the Array Documentation for this, and %W is a one of ruby niceties which allows you create an array of strings, e.g:
arr = %W{a b c}
arr # => ["a", "b", "c"]
It takes almost any special character as a delimiter e.g using . as a delimeter
arr = %W.a b c.
arr # => ["a", "b", "c"]
So in your snippet from the question / is delimiter used, so s would evaluate as below:
s = %W/This
is
a
test./
s # => ["This", "is", "a", "test."]
The above explains why the below works as it does
def count_lines(arr)
arr.size
end
s = %W/This
is
a
test./
print "Number of lines: ", count_lines(s), "\n"
# >> Number of lines: 4