like "how much of the range it fill" or "how much the ranges overlap" |
these might feel redundant when we have array contains operators. We have three different way to discuss similar things set theory , array ops , and has/isin The has/is-in will be useful later when we abstract We can ovoid overloading array and set theory ops too much |
it means "array A has element B" "array A has array B" checks if an element of A IS the array B You can put comparator and formula in has/isnin braks eg. A has > 5 or A has [1] = 5 (any A[*][1] = 5) . Set theory operators compare 2 arrays to each other |