❗️Что будет на выходе:

const operations = {
  add: (a, b) => a + b,
  subtract: (a, b) => a - b,
  multiply: (a, b) => a * b,
  divide: (a, b) => b !== 0 ? a / b : null,
};

const pipeline = (...fns) => (value) => fns.reduce((acc, fn) => fn(acc), value);

const double  = (x) => operations.multiply(x, 2);
const addTen  = (x) => operations.add(x, 10);
const halve   = (x) => operations.divide(x, 2);
const subtractThree = (x) => operations.subtract(x, 3);

const transform = pipeline(double, addTen, halve, subtractThree);

console.log(transform(5));

Ответ: 7

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