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               const pluckDeep = key => obj => key.split('.').reduce((accum, key) => accum[key], obj) 


            
            const compose = (...fns) => res => fns.reduce((accum, next) => next(accum), res) 


            
            const unfold = (f, seed) => { 

              const go = (f, seed, acc) => { 

                const res = f(seed) 

                return res ? go(f, res[1], acc.concat([res[0]])) : acc 

              } 

              return go(f, seed, []) 

            }