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Naming conventions: Difference between revisions
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[MERCURY, VENUS, EARTH, MARS, JUPITER, SATURN, URANUS, NEPTUNE, PLUTO]
</pre>
=={{header|Lambdatalk}}==
<lang scheme>
Naming conventions
1) global names
- a name is a group of any character except space and curly braces {}
for instance "add", "+", "123", "()", "a.b.c", "...", ...
- but giving a variable the name of the 9 special forms (keywords)
["lambda", "def", "if", "let", "quote", "macro", "script", "style", "require"]
or of one of the more than 170 primitives
["div", ..., "+", ..., "cons", ..., A.new, A.first, A.rest, ..., long_add, ...]
is possible but is obviously strongly discouraged.
- when a function calls an helper function, it's better to prefix the helper function's name
with the calling function's name. For instance the function "fibonacci" sets
some initializations and calls the recursive part "fibonacci.rec".
- functions organized into sets (libraries) should be named with a common prefix.
For instance the set of functions working on complex numbers [ "C.new", "C.x", "C.y", "C.+", "C.*", ...],
suggesting object-oriented programming.
2) local names
Consider this example:
{def add {lambda {:a :b} :a+:b is equal to {+ :a :b}}}
-> add
{add 3 4}
-> 3+4 is equal to 7
When the add function is called the occurences of arguments {:a :b} are replaced by the given values, [3 4],
in the body of the function ":a+:b is equal to {+ :a :b}", leading to "3+4 is equal to {+ 3 4}" and finally
to "3+4 is equal to 7". Note that the character "a" inside the word "equal" has not been replaced.
So generally speaking:
- inside a function local defined arguments must be prefixed by a colon, ":",
- they must have a null intersection. For instance this arguments list {:a1 :a2} is valid
because the intersection of :a1 and :a2 is null, but this one {:a :a1} is not,
because the intersection of :a and :a1 is :a.
- an alternative could be to prefix and postfix names, say :a: and :a1: which have a null intersection.
It's a matter of choice let to the coder. In all cases naming must be done with the utmost care.
</lang>
=={{header|Lua}}==
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