We used tmp a lot in JavaScript.
For example, like this ...
let a = [0, 1];
const tmp = a[1];
a[0] = a[1];
a[1] = tmp;
console.log(a); // 1, 0
If you don't like this style, what about the following?
let a = [0, 1];
[a[1], a[0]] = [a[0], a[1]];
console.log(a); // 1, 0
😉
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