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Diffstat (limited to 'runtime/doc/vim9.txt')
| -rw-r--r-- | runtime/doc/vim9.txt | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/runtime/doc/vim9.txt b/runtime/doc/vim9.txt index b73011a09..15e9a702b 100644 --- a/runtime/doc/vim9.txt +++ b/runtime/doc/vim9.txt @@ -1410,6 +1410,21 @@ to a Vim9 function: 'three' ] + +Calling a function in an expr option ~ + *expr-option-function* +A few options, such as 'foldexpr', are an expresison that is evaluated to get +a value. The evaluation can have quite a bit of overhead. One way to +minimize the overhead, and also to keep the option value very simple, is to +defined a compiled function and set the option to call it without arguments. +Example: > + vim9script + def MyFoldFunc(): any + ... compute fold level for line v:lnum + return level + enddef + set foldexpr=s:MyFoldFunc() + ============================================================================== 4. Types *vim9-types* |