rebol - 如何在 REBOL 中将函数作为参数传递

Question

我试图在 REBOL 编程语言中将函数作为参数传递，但我还没有找到正确的语法:

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.}

这会产生一个错误，因为 print 函数被调用而不是被传递:

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前添加 :。

这里，:print 函数被作为参数传递，而不是以“hello”作为参数被调用:

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.}