[Compose] 17. List comprehensions with Applicative Functors _functor

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We annihilate the need for the ol‘ nested for loop using Applicatives.

For example we have this kind of nested loop code:

for(x in xs){ for(x in ys){ for(z in zs){} } }

【[Compose] 17. List comprehensions with Applicative Functors】
We can refactor it by using List comprehension:

const {List} = Immutable;
const res1 = List.of(x => x).ap(List([1,2,3])); console.log(res1) // List [ 1,2,3 ]

const res1 = List.of(x => y=> `${x} - ${y}`) .ap(List([‘teeshirt‘, ‘sweater‘])) .ap(List([‘large‘, ‘medium‘, ‘small‘])); console.log(res1) //List [ "teeshirt - large", "teeshirt - medium", "teeshirt - small", "sweater - large", "sweater - medium", "sweater - small" ]