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25 lines
1.3 KiB
Plaintext
25 lines
1.3 KiB
Plaintext
/*
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Coalesce is a very simple concept in programming, essentially it takes a list of arguments and tells you the first one that is not null
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Natively byond has no such thing but we added it
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the syntax is coalesce(var1,var2...)
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*/
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//As an example lets use A simple fallback system to check for an id
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//This code is entirely fictional and only demonstrates syntax
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/proc/get_ID(/mob/carbon/m)
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return coalesce( getID(handslotL),
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getID(handslotR),
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getID(beltslot)
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)
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//Now assuming getID was a real proc that either returned NULL or an ID in a given storage slot.
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// This code would check all 3 slots and then return the first ID we find.
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// This makes it so we do not have to do any extra if/else statements, we simply use whatever is present first.
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//as a second example you can also use coalesce as a fallback
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/proc/fetch_name_with_fallback(var/name,var/nametwo)
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coalesce(name, nametwo, "Not found")
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//Now what this will do is return name, if name is not null, nametwo if name is null but nametwo isnt null
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//however if both given vars are in fact null we have a hardocded fallback "not found" that will always return instead
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//now the important part here is the order. Always put the fallback last as arguments are checked based on their occurence in the list.
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