您可以比较多个变量以查看它们在JS中是否都等于相同的值吗？ [英] Can you compare multiple variables to see if they all equal the same value in JS?

问题描述

使用Javascript，我试图查看在给定的时间是否5个不同的变量都包含相同的值。该值可能是6项中的1项，但是无论它是哪个值，我都需要查看它们是否都相同。我已经尝试过：

Working in Javascript, I am trying to see if 5 different variables all contain the same value at a given time. The value could be 1 of 6 things, but I need to see if they are all the same regardless of which value it is. I have tried this:

if (die1 == die2 & die1 == die3 & die1 == die4 & die1 == die5) {
    yahtzeeQualify == true;
}

，并且：

if (die1 == die2 == die3 == die4 == die5) {
    yahtzeeQualify == true;
}

以下任一有效吗？如果是这样，我的代码可能在其他地方出错了。如果没有，我将非常感谢您的帮助。我在名为dieArray的数组中也有这些变量，如下所示：

Are either of these valid? If so, there is probably an error in my code somewhere else...if not, I'd really appreciate some help. I also have these variables in an array called dieArray as follows:

var dieArray = [die1, die2, die3, die4, die5];

学习通过数组执行此操作的方法很酷，但是如果不是这样顺理成章吧。我会继续尝试自己想办法，但是直到现在我还是被困住...

It would be cool to learn a way to do this via the array, but if that isn't logical then so be it. I'll keep trying to think of a way on my own, but up until now I've been stuck...

推荐答案

这两个都有效吗？

Are either of these valid?

它们是有效的（因为这是可执行代码）但是他们不执行您想要的计算。您要使用逻辑与（& ）不是按位AND。

They are "valid" (as in this is executable code) but they don't perform the computation you want. You want to use a logical AND (&&) not a bitwise AND.

第二个错误。您遇到强制类型问题，最终将 die1 与 true 或 false 。

The second one is just wrong. You run into type coercion issues and end up comparing die1 to either true or false.

通过数组学习实现此方法很酷

It would be cool to learn a way to do this via the array

您可以使用 Array＃every 并比较每个元素是否等于第一个元素：

You can use Array#every and compare whether each element is equal to the first one:

if (dieArray.every(function(v) { return v === dieArray[0]; }))
// arrow functions make this nicer:
// if (dieArray.every(v => v === dieArray[0]))

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