Using allTrue (or allPass in Ramda)

// ---------- a selection of library functions ----------------------------- const curry = f => (...args) => args.length >= f.length ? f(...args) : curry(f.bind(undefined, ...args)) const compose = (...fns) => xs => fns.reduceRight((v, f) => f(v), xs) const filter = curry((f, xs) => Array.prototype.filter.call(xs, f)) const every = curry((f, xs) => Array.prototype.every.call(xs, f)) const map = curry((f, xs) => Array.prototype.map.call(xs, f)) const gt = curry((targ, n) => n > targ) const lt = curry((targ, n) => n < targ) const isEven = n => n % 2 === 0 const allTrue = curry((preds, x) => every(pred => pred(x), preds)) const double = n => n * 2 // ---------- end library functions --------------------------------------- // Application code... const doubleEvensBetween5And15 = compose( map(double), // below, how to log to the console within a compose call. ary => console.log('Intermediate array ', ary) || ary, // => [6, 8, 10, 12, 14] filter(allTrue([isEven, lt(15), gt(5)])) ) const integers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20] console.log(doubleEvensBetween5And15(integers)) // => [12, 16, 20, 24, 28]