The Python documentation gives you pure-python equivalents for both functions; they are trivial to translate to JavaScript:
function any(iterable) {
for (var index = 0; index < iterable.length; index++) {
if (iterable[index]) return true;
}
return false;
}
and
function all(iterable) {
for (var index = 0; index < iterable.length; index++) {
if (!iterable[index]) return false;
}
return true;
}
Recent browser versions (implementing ECMAScript 5.1, Firefox 1.5+, Chrome, Edge 12+ and IE 9) have native support in the form of Array.some
and Array.every
; these take a callback that determines if something is 'true' or not:
some_array.some((elem) => !!elem );
some_array.every((elem) => !!elem );
The Mozilla documentation I linked to has polyfills included to recreate these two methods in other JS implementations.