What does the +d in
function addMonths(d, n, keepTime) {
if (+d) {
mean?
What does the +d in function addMonths(d, n, keepTime) { if (+d) { mean?
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The
+operator returns the numeric representation of the object. So in your particular case, it would appear to be predicating the if on whether or notdis a non-zero number.Reference here. And, as pointed out in comments, here.