ObjC/Swift Ruby 里面有没有像 Swift 的 In-Out Parameters 的东西
func swapTwoInts(inout a: Int, inout b: Int) {
let temporaryA = a
a = b
b = temporaryA
}
var someInt = 3
var anotherInt = 107
swapTwoInts(&someInt, &anotherInt)
println("someInt is now \(someInt), and anotherInt is now \(anotherInt)")
// prints "someInt is now 107, and anotherInt is now 3
就是说把外面的参数传进去能在 function 里面直接改了这样子
serco
#2
2014年07月01日
我是勤劳的搬运工
def swap(var_a, var_b, vars)
old_a = eval var_a, vars
old_b = eval var_b, vars
eval "#{var_a} = #{old_b}", vars
eval "#{var_b} = #{old_a}", vars
end
a = 22
b = 33
swap ("a", "b", binding)
p a # => 33
p b # => 22
