All initialization should be value to pass in the conditional test

[FilipeBeck]

It would be more useful if all initialized values ​​were automatically tested against null and undefined, failing the test if any value does not pass the test. Any other value (including 0, "" or false) will pass the test.

if (let oneDate = getOneDate(), anotherDate = getAnotherDate(); oneDate.getDay() >= 5) {
  // ...
}

Here, if oneDate or anotherDate is null | undefined, the test fails. Otherwise, if both have values, check if oneDate.getDay () >= 5

Perhaps where could be used instead of ;.

if (let oneDate = getOneDate() where oneDate.getDay() >= 5) {
  // ...
}

[dcrousso]

while i do like the idea of automatically checking that all values are truthy, but i fear it might be too subtle

one could argue that it should instead just require that at least one value is truthy (which to me at least somehow feels more in line with the generally permissive nature of JS)

if (let x = false, y = true, z = false) {
    // ...
} else {
    // not reached
}

as such, id much rather have the condition be explicit with a second expression after a ;

if (let x = false, y = true, z = false; y) {
    // ...
} else {
    // not reached
}

btw i think this is extremely similar to the discussion about destructuring in #11