## mark a section (Learn more)

a = [] 100000.times { a << 1 } t1 = Thread.new do loop { p a.to_s.length; sleep 0.5 } end t2 = Thread.new do loop { a.clear; sleep 0.01 100000.times { a << 1 } sleep 0.01 } end t3 = Thread.new do loop { a.clear; sleep 0.01 100000.times { a << 1 } sleep 0.01 } end t1.join t2.join t3.join

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