moltres-utils/dist/data/pipe.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 _length = _interopRequireDefault(require("./length"));

var _reduce = _interopRequireDefault(require("./reduce"));

var _tail = _interopRequireDefault(require("./tail"));

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

/**
 * Performs left-to-right function composition. The leftmost function may have
 * any arity; the remaining functions must be unary.
 *
 * In some libraries this function is named `sequence`.
 *
 * **Note:** The result of pipe is not automatically curried.
 *
 * @func
 * @category Function
 * @sig (((a, b, ..., n) -> o), (o -> p), ..., (x -> y), (y -> z)) -> ((a, b, ..., n) -> z)
 * @param {...Function} functions
 * @return {Function}
 * @example
 *
 *      const f = pipe(Math.pow, negate, inc);
 *
 *      f(3, 4); // -(3^4) + 1
 * @symb pipe(f, g, h)(a, b) = h(g(f(a, b)))
 */
const pipe = (...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 firstFunc = (0, _head.default)(funcs);
  const rest = (0, _tail.default)(funcs);
  return (...args) => (0, _reduce.default)((piped, func) => func(piped), firstFunc(...args), rest);
};

var _default = pipe;
exports.default = _default;
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