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patch 8.1.1834: cannot use a lambda as a method

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Problem:    Cannot use a lambda as a method.
Solution:   Implement ->{lambda}(). (closes #4768)
This commit is contained in:
Bram Moolenaar
2019-08-09 23:25:08 +02:00
parent 0c779e8e48
commit 22a0c0c4ec
4 changed files with 120 additions and 48 deletions
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6
runtime/doc/eval.txt
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@@ -1217,7 +1217,8 @@ expr8(expr1, ...) |Funcref| function call
When expr8 is a |Funcref| type variable, invoke the function it refers to.
expr8->name([args]) method call *method*
expr8->name([args]) method call *method* *->*
expr8->{lambda}([args])
For methods that are also available as global functions this is the same as: >
name(expr8 [, args])
@@ -1227,6 +1228,9 @@ This allows for chaining, passing the value that one method returns to the
next method: >
mylist->filter(filterexpr)->map(mapexpr)->sort()->join()
<
Example of using a lambda: >
GetPercentage->{x -> x * 100}()->printf('%d%%')
*E274*
"->name(" must not contain white space. There can be white space before the
"->" and after the "(", thus you can split the lines like this: >