goes toward operator

goestoward.swift

infix operator --> { associativity left precedence 80 }
func --><T:IntegerType>(inout left:T, right:T) -> Bool {
    if left != right {
        left = left.advancedBy(left > right ? -1 : 1)
        return true
    } else {
        return false
    }
}

// example use
var i = 6
print("6 --> 0")
while i --> 0 {
    print(i)
}

// also goes up
i = 3
print("3 --> 6")
while i --> 6 {
    print(i)
}