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Diffstat (limited to 'runtime/doc/eval.txt')
| -rw-r--r-- | runtime/doc/eval.txt | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt index 196e71cf0..8dfbb3a28 100644 --- a/runtime/doc/eval.txt +++ b/runtime/doc/eval.txt @@ -1240,6 +1240,7 @@ function returns: > :let Bar = Foo(4) :echo Bar(6) < 5 +See also |:func-closure|. Examples for using a lambda expression with |sort()|, |map()| and |filter()|: > :echo map([1, 2, 3], {idx, val -> val + 1}) @@ -8217,7 +8218,7 @@ last defined. Example: > See |:verbose-cmd| for more information. *E124* *E125* *E853* *E884* -:fu[nction][!] {name}([arguments]) [range] [abort] [dict] +:fu[nction][!] {name}([arguments]) [range] [abort] [dict] [closure] Define a new function by the name {name}. The name must be made of alphanumeric characters and '_', and must start with a capital or "s:" (see above). Note @@ -8260,6 +8261,28 @@ See |:verbose-cmd| for more information. be invoked through an entry in a |Dictionary|. The local variable "self" will then be set to the dictionary. See |Dictionary-function|. + *:func-closure* *E932* + When the [closure] argument is added, the function + can access variables and arguments from the outer + scope. This is usually called a closure. In this + example Bar() uses "x" from the scope of Foo(). It + remains referenced even after Foo() returns: > + :function! Foo() + : let x = 0 + : function! Bar() closure + : let x += 1 + : return x + : endfunction + : return function('Bar') + :endfunction + + :let F = Foo() + :echo F() +< 1 > + :echo F() +< 2 > + :echo F() +< 3 *function-search-undo* The last used search pattern and the redo command "." |