moltres-utils/dist/common/pipe.js

Utils for Moltres apps

"use strict";

require("core-js/modules/es6.object.define-property");

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

var _arrayFlatten = _interopRequireDefault(require("../lang/arrayFlatten"));

var _arrayLikeReduce = _interopRequireDefault(require("../lang/arrayLikeReduce"));

var _arrayLikeSlice = _interopRequireDefault(require("../lang/arrayLikeSlice"));

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

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

// TODO BRN: This method is important at a fundamental level. Need to rewrite this to not depend upon data methods.

/**
 * 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.
 *
 * @function
 * @since v0.0.11
 * @category common
 * @param {...Function} functions
 * @returns {Function}
 * @example
 *
 * const f = pipe(Math.pow, negate, inc)
 *
 * f(3, 4) // -(3^4) + 1
 */
var pipe = function pipe() {
  for (var _len = arguments.length, functions = new Array(_len), _key = 0; _key < _len; _key++) {
    functions[_key] = arguments[_key];
  }

  functions = (0, _arrayFlatten.default)(functions);
  var _functions = functions,
      length = _functions.length;

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

  if (length === 1) {
    return functions[0];
  }

  var firstFunc = functions[0];
  var rest = (0, _arrayLikeSlice.default)(functions, 1);
  return function () {
    return (0, _arrayLikeReduce.default)(rest, firstFunc.apply(void 0, arguments), function (piped, func) {
      return func(piped);
    });
  };
};

var _default = pipe;
exports.default = _default;
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