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bohford/stupid_jruby_tricks.rb

Created December 1, 2011 08:10
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Stupid JRuby tricks
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stupid_jruby_tricks.rb
# JRuby 1.6.5 + Java 6
# 01 - Small Array Instantiation
# A new, empty array preallocates memory for 16 elements
# An array that starts non-empty and is subsequently cleared will only have memory allocated for one element
# Ergo, if you know your array will stay small, define with [nil].clear
empty_array = [] # 152 bytes
cleared_array = [nil].clear # 32 bytes
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