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# Observations:
# - block defines a lexical scope
# - variables defined in the block are not visible outside the block
# - variables defined before the block are visible in the block unless they are stated after ; in block params
# - semicolon is similar to comma
# - comma hides outside variables because it represents a local variable assignment
# - the variables following the semicolon are not formal parameters though
def foo2
puts '|a;x|'
x = 1
1.times { |a;x|
puts "in-x = #{x}"
x = 2
}
puts "x = #{x}"
puts
end
def foo3
puts '|a,x|'
x = 1
1.times { |a,x|
puts "in-x = #{x}"
x = 2
}
puts "x = #{x}"
puts
end
def foo4
puts '|a|'
x = 1
1.times { |a|
puts "in-x = #{x}"
x = 2
}
puts "x = #{x}"
puts
end
foo2
foo3
foo4
puts '---'
def goo
yield 1,2
end
goo { |x,y| p x,y}
goo { |x;y| p x,y}
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