What is the equivalent of python any() and all() functions in JavaScript?
You can use lodash.
lodash.every
is equivalent to all
lodash.some
is equivalent to any
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.