Transform some piece of data with an array of functions + Array.reduce

transformations.js

// transformations as an array of arrow functions

// example for transformations of an array, in this case [1,2,3]
const pipeline = [
  // transformation functions here
  array => { array.pop(); return array; },
  array => array.reverse()
];

pipeline.reduce((xs, f) => f(xs), [1, 2, 3]);

// Generalization
const pipe = functions => data => {
  return functions.reduce(
    (resultSoFar, func) => func(resultSoFar),
    data
  );
};

const pipeline = pipe([
  x => x * 2,
  x => x / 3,
  x => x > 5,
  b => !b
]);

pipeline(5);
// true
pipeline(20);
// false