如何在REBOL中将函数作为参数传递

Question

我试图将函数作为参数传递给REBOL编程语言,但我还没有想出正确的语法:

doSomething: func [a b] [
    a b
    a b
]

doSomething print "hello" {This should pass print as the first argument and "hello" as the second argument.}

这会产生错误,因为print正在调用函数而不是传递函数:

hello
*** ERROR
** Script error: doSomething does not allow unset! for its a argument
** Where: try do either either either -apply-
** Near: try load/all join %/users/try-REBOL/data/ system/script/args...

是否可以将print函数作为参数传递而不是调用print函数？

Answer 1

我找到了解决方案:我只需要:在作为参数传递的函数名称之前添加.

这里,:print函数作为参数传递,而不是以"hello"作为参数调用:

doSomething: func [a b] [
    a b
    a b
]

doSomething :print "hello" {This should pass print as the first argument and "hello" as the second argument.}