moltres-utils/dist/data/compose.js

Utils for Moltres apps

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

var _flatten = _interopRequireDefault(require("./flatten"));

var _head = _interopRequireDefault(require("./head"));

var _identity = _interopRequireDefault(require("./identity"));

var _init = _interopRequireDefault(require("./init"));

var _last = _interopRequireDefault(require("./last"));

var _length = _interopRequireDefault(require("./length"));

var _reduceRight = _interopRequireDefault(require("./reduceRight"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * Performs right-to-left function composition. The rightmost function may have
 * any arity; the remaining functions must be unary.
 *
 * **Note:** The result of compose is not automatically curried.
 *
 * @func
 * @category Function
 * @sig ((y -> z), (x -> y), ..., (o -> p), ((a, b, ..., n) -> o)) -> ((a, b, ..., n) -> z)
 * @param {...Function} ...functions The functions to compose
 * @return {Function}
 * @example
 *
 *      const classyGreeting = (firstName, lastName) => "The name's " + lastName + ", " + firstName + " " + lastName
 *      const yellGreeting = compose(R.toUpper, classyGreeting);
 *      yellGreeting('James', 'Bond'); //=> "THE NAME'S BOND, JAMES BOND"
 *
 *      compose(Math.abs, add(1), multiply(2))(-4) //=> 7
 *
 * @symb R.compose(f, g, h)(a, b) = f(g(h(a, b)))
 */
const compose = (...funcs) => {
  funcs = (0, _flatten.default)(funcs);
  const size = (0, _length.default)(funcs);

  if (size === 0) {
    return _identity.default;
  }

  if (size === 1) {
    return (0, _head.default)(funcs);
  }

  const lastFunc = (0, _last.default)(funcs);
  const rest = (0, _init.default)(funcs);
  return (...args) => (0, _reduceRight.default)((composed, func) => func(composed), lastFunc(...args), rest);
};

var _default = compose;
exports.default = _default;
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