chain function execution using reduce

chainFunctions.js

/**
 * chainFunctions() creates a function that returns the result of invoking the given list of functions with
 * where each successive invocation is supplied the return value of the previous.
 * @example
 *   const replacer = chainFunctions([replaceNewLine, replaceEntities, replaceMultiSpace]);
 *   const cleanStr = replacer(originalString);
 * @param {Function[]} fns - list of functions to be invoked
 * @returns {*} function execution result
 */
export const chainFunctions = (fns) => (input) => fns.reduce((value, fn) => fn(value), input);

  const replacer = chainFunctions([replaceNewLine, replaceEntities, replaceMultiSpace]);
  const cleanStr = replacer(originalString);

help create better abstraction when we don't want to modify String or native object, but still need to chain multiple functions and pipe result of previous operation into the next function.

[replaceNewLine, replaceEntities, replaceMultiSpace]

This looks simple but these steps done inside a large function, what's happening and why will quickly get lost.