17.3" Led Lcds

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This first edition was written for Lua 5.0. While still largely relevant for later versions, there are some differences.
The fourth edition targets Lua 5.3 and is available at Amazon and other bookstores.
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17.3 Laptop

17.3 – Revisiting Tables with Default Values

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In Section 13.4.3, we discussed how to implement tables withnon-nil default values.We saw one particular technique and commented that two othertechniques need weak tables so we postponed them.Now it is time to revisit the subject.As we will see, those two techniques for default valuesare actually particular applications of the two generaltechniques that we have seen here:object attributes and memoizing.

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In the first solution,we use a weak table to associate to each table its default value:If defaults had not weak keys,it would anchor all tables with default values into permanent existence.

In the second solution,we use distinct metatables for distinct default values,but we reuse the same metatable whenever we repeat a default value.This is a typical use of memoizing:We use weak values, in this case,to allow the collection of metatables that are notbeing used anymore.

Given these two implementations for default values,which is best?As usual, it depends.Both have similar complexity and similar performance.The first implementation needs a few words for eachtable with a default value (an entry in defaults).The second implementation needs a few dozen words foreach distinct default value(a new table, a new closure, plus an entry in metas).So, if your application has thousands of tables with afew distinct default values,the second implementation is clearly superior.On the other hand, if few tables share common defaults,then you should use the first one.