arrayMin<T extends num> function
Implementation
T? arrayMin<T extends num>(List<T> array) {
if (array.isEmpty) return null; //return 9999999;
var min = array[0];
for (var i = 1, l = array.length; i < l; ++i) {
if (array[i] < min) min = array[i];
}
return min;
}