Checks whether every element of this iterable satisfies test.
Checks every element in iteration order, and returns false if
any of them make test return false, otherwise returns true.
Source
bool every(bool test(E element)) {
int length = this.length;
for (int i = 0; i < length; i++) {
if (!test(this[i])) return false;
if (length != this.length) {
throw new ConcurrentModificationError(this);
}
}
return true;
}