const applyMethod = method => (obj, arg) => obj[method](arg); Array.prototype.collect = function (f) { return this .map(f) .reduce(applyMethod('concat'), []); }; const bits = [1, 0]; const xor = (a, b) => a === b ? 0 : 1; const results = bits.collect( x => bits.collect( y => bits.collect( z => xor(xor(x, y), z) === xor(x, xor(y, z)) ))); const isTruthy = Boolean; console.log(results.every(isTruthy));