[Javascript] Advanced Reduce: Composing Functions with Reduce

Learn how to use array reduction to create functional pipelines by composing arrays of functions.

const increase = (input) => {
  return input + 1;
}

const decrease = (input) => {
  return input - 1;
}

const double = (input) => {
  return input * 2;
}

const halven = (input) => {
  return input / 2;
}

let pipelines = [
  increase,
  increase,
  decrease,
  double,
  halven,
  increase
];

let init_value = 1;

let res = pipelines.reduce( (acc, fn) => {
  return fn(acc);
}, init_value );

console.log(res);