diff options
Diffstat (limited to 'runtime/doc/usr_52.txt')
| -rw-r--r-- | runtime/doc/usr_52.txt | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/runtime/doc/usr_52.txt b/runtime/doc/usr_52.txt index 70338e79a7..1fbd66f3c3 100644 --- a/runtime/doc/usr_52.txt +++ b/runtime/doc/usr_52.txt @@ -1,4 +1,4 @@ -*usr_52.txt* For Vim version 8.2. Last change: 2022 May 13 +*usr_52.txt* For Vim version 8.2. Last change: 2022 May 16 VIM USER MANUAL - by Bram Moolenaar @@ -110,10 +110,10 @@ Although it's shorter to do: > ============================================================================== *52.3* Functions and types -Legacy Vim script does have type checking, but this happens at runtime, when -the code is executed. And it's permissive, often a computation gives an -unexpected value instead of reporting an error. Thus you can define a -function and think it's fine, but see a problem only later when it is called: > +Legacy Vim script only checks types at runtime, when the code is executed. +And it's permissive, often a computation gives an unexpected value instead of +reporting an error. Thus you can define a function and think it's fine, but +see a problem only later when it is called: > let s:collected = '' func ExtendAndReturn(add) let s:collected += a:add @@ -133,12 +133,16 @@ the argument is used without the "a:" prefix: > s:collected += add return s:collected enddef - defcompile + disassemble ExtendAndReturn -Here we use `:defcompile` to do the compilation right away, without it the +Here we use `:disassemble` to do the compilation right away, without it the compilation would happen when the function is called. Vim will tell you what you did wrong: > - E1013: type mismatch, expected number but got string + E1051: Wrong argument type for + + +Side note: here the context is legacy script, when using Vim9 script you would +put `:defcompile` at the end of the script to check for errors in the +functions defined in it. Vim9 script is strict, it uses the "+" operator only for numbers and floats. For string concatenation ".." must be used. This avoids mistakes and avoids |