How can we convey the concept of both a and b being true or neither a nor b being true, meaning that the boolean values of a and b are identical?
How can we convey the concept of both a and b being true or neither a nor b being true, meaning that the boolean values of a and b are identical?
Two possible solutions for checking equality between two boolean values are !(a ^ b) and !a === !b:
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}`);
}.as-console-wrapper {
max-height: 100% !important;
}The XOR operator ^ is used to determine exclusive disjunction of its operands by converting them to numbers (true becomes 1, while false becomes 0).
The expression !a === !b simplifies the comparison by converting any truthy value to false and any falsy value to true before directly comparing the results.
When it comes to comparing Boolean results for equality, there are numerous approaches. However, due to the unfamiliarity of people with this concept and the potential risks associated with it in JavaScript, I prefer the following method:
if (a ? b : !b) {
...
}
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