Fills and returns new array with values val up to size
Returns product of all lengths of array ([[1, 2, 3], [1, 3]].deepLength -> 6)
Fills array with values val up to size if it's not 0
Fills and returns new array with values val up to size
Returns true if val is one of vals
Returns base type of array (int[3][2][5] -> int)
Small array utils