flo-utils/es/useCurry.js

some utils

function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _unsupportedIterableToArray(arr) || _nonIterableSpread(); }

function _nonIterableSpread() { throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }

function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }

function _iterableToArray(iter) { if (typeof Symbol !== "undefined" && Symbol.iterator in Object(iter)) return Array.from(iter); }

function _arrayWithoutHoles(arr) { if (Array.isArray(arr)) return _arrayLikeToArray(arr); }

function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }

/**
 * 函数式编程 柯里化
 * 完成类似lodash.curry功能，并进行扩展
 * @example
var abc = function(a, b, c) {
  return [a, b, c];
};

var curried = useCurry(abc);

curried(1)(2)(3);
// => [1, 2, 3]

curried(1, 2)(3);
// => [1, 2, 3]

curried(1, 2, 3);
// => [1, 2, 3]

// Curried with placeholders.
curried(1)(_, 3)(2);
// => [1, 2, 3]
 */
var placeholder = '_'; // 占位符

/**
 *
 * @param {*} targetfn
 * @param {*} args
 * @returns
 */

function useCurry(targetfn) {
  var nextPos = 0; // 下一个有效参数索引

  for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
    args[_key - 1] = arguments[_key];
  }

  var preset = [].concat(args); // 预设参数

  var argsNum = targetfn.length; // 目标函数参数个数

  var fps = preset.filter(function (p) {
    return p !== placeholder;
  });

  if (fps.length === argsNum) {
    return targetfn.apply(void 0, _toConsumableArray(fps));
  }

  return function () {
    for (var _len2 = arguments.length, added = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
      added[_key2] = arguments[_key2];
    }

    // 循环并将added参数添加到preset参数
    while (added.length > 0) {
      var a = added.shift(); // 获取下一个占位符的位置，可以是'_'也可以是preset的末尾

      while (preset[nextPos] !== placeholder && nextPos < preset.length) {
        nextPos += 1;
      } // 更新preset


      preset[nextPos] = a;
      nextPos += 1;
    }

    return useCurry.call.apply(useCurry, [null, targetfn].concat(_toConsumableArray(preset)));
  };
}

export default useCurry;