September 2013
Intermediate to advanced
548 pages
12h 25m
English
Content preview from Programming Erlang, 2nd Edition
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apply
The BIF apply(Mod, Func, [Arg1, Arg2, ..., ArgN])
applies the function Func in the module
Mod to the arguments Arg1, Arg2,
... ArgN. It is equivalent to calling this:
| | Mod:Func(Arg1, Arg2, ..., ArgN) |
apply lets you call a function in a module, passing it
arguments. What makes it different from calling the function
directly is that the module name and/or the function name can be
computed dynamically.
All the Erlang BIFs can also be called using apply by assuming
that they belong to the module erlang. So, to build a dynamic
call to a BIF, we might write the following:
| | 1> apply(erlang, atom_to_list, [hello]). |
| | "hello" |
Warning: The use of apply should be avoided if possible. When the number of arguments to a function is known in advance, ...
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