2629/main.js


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#!/usr/bin/env node
/**
 * @param {Function[]} functions
 * @return {Function}
 */
var compose = function (functions) {
  return function (x) {
    var result = x;
    for (var i = functions.length - 1; i >= 0; i--) {
      result = functions[i](result);
    }
    return result;
  };
};

const fn = compose([(x) => x + 1, (x) => 2 * x]);
console.log(fn(4)); // 9