英文:
Javascript - Is there a clearer way to express "if (a && b || !a && !b)"?
问题
"如果a和b都为真，或者都不为真"
英文:
Would like to express "if both/neither a and/nor b are true", i.e. the boolean values of a and b are the same
答案1
得分: 1
你可以使用 !(a ^ b) 或 !a === !b：
test(true, true);
test(false, false);
test(true, false);
test(false, 1); // 1 = 真值
test(false, ""); // "" = 假值
function test(a, b) {
console.log(`!(${JSON.stringify(a)} ^ ${JSON.stringify(b)}) => ${!(a ^ b)}`);
console.log(`!${JSON.stringify(a)} === !${JSON.stringify(b)} => ${!a === !b}`);
}
^ 是异或（XOR）运算符。它将其操作数转换为数字（true => 1，false => 0）并对它们执行异或操作。
!a === !b 之所以有效，是因为任何 ! 都会将任何真值转换为 false，将任何假值转换为 true，然后可以直接比较它们。
英文:
You can use !(a ^ b) or !a === !b:
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-js -->
test(true, true);
test(false, false);
test(true, false);
test(false, 1); // 1 = truthy value
test(false, ""); // "" = falsy value
function test(a, b) {
console.log(`!(${JSON.stringify(a)} ^ ${JSON.stringify(b)}) => ${!(a ^ b)}`);
console.log(`!${JSON.stringify(a)} === !${JSON.stringify(b)} => ${!a === !b}`);
}
<!-- language: lang-css -->
.as-console-wrapper {
max-height: 100% !important;
}
<!-- end snippet -->
^ is the exclusive-or (XOR) operator. It converts its operands to numbers (true => 1, false => 0) and does an XOR on them.
!a === !b works because any ! converts any truthy value to false and any falsy value to true, and then you can directly compare them.
答案2
得分: 0
Sure, here is the translation:
有很多方法，但由于人们不习惯比较布尔值的相等性，而且因为这在 JavaScript 中是一种危险的习惯，我喜欢：
if (a ? b : !b) {
...
}
英文:
There are lots of ways, but since people aren't used to comparing Boolean results for equality, and because it's a dangerous habit to get into in JS, I like:
if (a ? b : !b) {
...
}
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