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Diffstat (limited to 'Doc/Zsh')
| -rw-r--r-- | Doc/Zsh/func.yo | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/Doc/Zsh/func.yo b/Doc/Zsh/func.yo index 6b6202831..65bcd9abc 100644 --- a/Doc/Zsh/func.yo +++ b/Doc/Zsh/func.yo @@ -150,6 +150,42 @@ executing tt(myfunc), use: example(autoload +X myfunc) +sect(Anonymous Functions) +cindex(anonymous functions) +cindex(functions, anonymous) + +If no name is given for a function, it is `anonymous' and is handled +specially. Either form of function definition may be used: a `tt(())' with +no preceding name, or a `tt(function)' with an immediately following open +brace. The function is executed immediately at the point of definition and +is not stored for future use. The function name is set to `tt((anon))' and +the parameter list passed to the function is empty. Note that this means +the argument list of any enclosing script or function is hidden. +Redirections may be applied to the anonymous function in the same manner as +to a current-shell structure enclosed in braces. The main use of anonymous +functions is to provide a scope for local variables. This is particularly +convenient in start-up files as these do not provide their own local +variable scope. + +For example, + +example(variable=outside +function { + local variable=inside + print "I am $variable" +} +print "I am $variable") + +outputs the following: + +example(I am inside +I am outside) + +Note that function definitions with arguments that expand to nothing, +for example `tt(name=; function $name { )var(...)tt( })', are not +treated as anonymous functions. Instead, they are treated as normal +function definitions where the definition is silently discarded. + sect(Special Functions) Certain functions, if defined, have special meaning to the shell. |