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vim9script
# Vim9 lambda expressions
# VIM_TEST_SETUP hi link vim9LambdaOperator Todo
# VIM_TEST_SETUP hi link vim9LambdaParen Todo
var Foo: func
var expr = 0
# without return type
Foo = () => expr
Foo = (_) => expr
Foo = (x) => expr
Foo = (...y) => expr
Foo = (_, ...y) => expr
Foo = (x, ...y) => expr
Foo = (x, y) => expr
Foo = (_: number) => expr
Foo = (x: number) => expr
Foo = (...y: list<number>) => expr
Foo = (_: number, ...y: list<number>) => expr
Foo = (x: number, ...y: list<number>) => expr
Foo = (x: number, y: number) => expr
# with return type
Foo = (): number => expr
Foo = (_): number => expr
Foo = (x): number => expr
Foo = (...y): number => expr
Foo = (_, ...y): number => expr
Foo = (x, ...y): number => expr
Foo = (x, y): number => expr
Foo = (_: number): number => expr
Foo = (x: number): number => expr
Foo = (...y: list<number>): number => expr
Foo = (_: number, ...y: list<number>): number => expr
Foo = (x: number, ...y: list<number>): number => expr
Foo = (x: number, y: number): number => expr
# with compound return type
Foo = (): list<number> => expr
Foo = (_): list<number> => expr
Foo = (x): list<number> => expr
Foo = (...y): list<number> => expr
Foo = (_, ...y): list<number> => expr
Foo = (x, ...y): list<number> => expr
Foo = (x, y): list<number> => expr
Foo = (_: number): list<number> => expr
Foo = (x: number): list<number> => expr
Foo = (...y: list<number>): list<number> => expr
Foo = (_: number, ...y: list<number>): list<number> => expr
Foo = (x: number, ...y: list<number>): list<number> => expr
Foo = (x: number, y: number): list<number> => expr
# Post-operator comments
Foo = () => # comment
expr
Foo = () =>
# comment
expr
Foo = () =>
# comment
expr
# Line continuations
Foo = (x: string,
\ y: number,
\ z: bool) => expr
Foo = (x: string,
\ y: number,
\ z: bool)
\ => expr
Foo = (x: string,
\ y: number,
\ z: bool): number => expr
Foo = (x: string,
\ y: number,
\ z: bool): number
\ => expr
Foo = (x: string,
\ y: number,
\ z: bool):
\ number => expr
# Funcref call
echo (() => 42)()
echo ((x: string): number => 42)("foo")
# :help vim9-lambda
var list = [1, 2, 3]
echo filter(list, (k, v) =>
v > 0)
echo filter(list, (k,
\ v)
\ => v > 0)
var Callback = (..._) => 'anything'
echo Callback(1, 2, 3) # displays "anything"
var Lambda = (arg) => {
g:was_called = 'yes'
return expr
}
var count = 0
var timer = timer_start(500, (_) => {
count += 1
echom 'Handler called ' .. count
}, {repeat: 3})
var dict = {}
var d = mapnew(dict, (k, v): string => {
return 'value'
})
# Issue #15970 (vim9: Restore and extend the recognition of Enum body items)
def Op(): func(func(number, number): number): func(number, Digit): number
return (F: func(number, number): number) =>
(x: number, y: Digit): number => F(x, y.value)
enddef ####################### ^ vimCommand?
# Issue #16965 (vim syntax: wrong highlight with lambda, autoload, and false keyword)
autocmd BufRead * timer_start(0, (_) => f#a(false, false))
autocmd
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