animalFarm.js

/*
Assuming there are no other types of animals, work out how many of each animal are there.

Return a tuple in Python - (chickens, cows) and an array list - [chickens, cows]/{chickens, cows} in all other languages

If either the heads & legs is negative, the result of your calculation is negative or the calculation is a float return "No solutions" (no valid cases).

In the form:

[Heads, Legs] = [72, 200]

VALID - [72, 200] =>             [44 , 28]   
                             [Chickens, Cows]

INVALID - [72, 201] => "No solutions"
However, if 0 heads and 0 legs are given always return [0, 0] since zero heads must give zero animals.

There are many different ways to solve this, but they all give the same answer.

You will only be given integers types - however negative values (edge cases) will be given.
*/

//Answer//

function animals(h, l){
let chicken = h-((l-(2*h))/2)
let cow = (l-(2*h))/2
return !((cow*chicken)%1)&&cow>=0&&chicken>=0?[chicken,cow]:'No solutions'
}