redux/es/compose.js

Predictable state container for JavaScript apps

/**
 * Composes single-argument functions from right to left. The rightmost
 * function can take multiple arguments as it provides the signature for
 * the resulting composite function.
 *
 * @param {...Function} funcs The functions to compose.
 * @returns {Function} A function obtained by composing the argument functions
 * from right to left. For example, compose(f, g, h) is identical to doing
 * (...args) => f(g(h(...args))).
 */

export default function compose() {
  for (var _len = arguments.length, funcs = Array(_len), _key = 0; _key < _len; _key++) {
    funcs[_key] = arguments[_key];
  }

  if (funcs.length === 0) {
    return function (arg) {
      return arg;
    };
  } else {
    var _ret = function () {
      var last = funcs[funcs.length - 1];
      var rest = funcs.slice(0, -1);
      return {
        v: function v() {
          return rest.reduceRight(function (composed, f) {
            return f(composed);
          }, last.apply(undefined, arguments));
        }
      };
    }();

    if (typeof _ret === "object") return _ret.v;
  }
}