比较三个值是否相等

Compare three values for equality(比较三个值是否相等)

问题描述

有人知道测试三个数字是否相同的捷径吗?我知道这行得通:

Does anybody know of a shortcut to test whether three numbers are the same? I know this works:

if number1 == number2 && number2 == number3 {

}

但我想要一些更干净的东西，例如；

But I would like something cleaner, such as;

if number1 == number2 == number3 {

}

这很重要，因为我要比较很多不同的值.

It's quite important as I'm comparing a lot of different values.

推荐答案

你可以利用元组的力量和平等的传递性.

You can use the power of tuples and the Transitive Property of Equality.

if (number1, number2) == (number2, number3) {

}

只有当 number1 等于 number2 AND number2 等于number3.这意味着这3个值必须相等.

The clause of this IF is true only when number1 is equals to number2 AND number2 is equals to number3. It means that the 3 values must be equals.

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