moltres-utils/dist/lang/arrayLikeIterator.js

Utils for Moltres apps

"use strict";

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

require("core-js/modules/es6.array.for-each");

require("core-js/modules/es6.array.filter");

require("core-js/modules/web.dom.iterable");

require("core-js/modules/es6.array.iterator");

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

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

var _indexEndOffset = _interopRequireDefault(require("./indexEndOffset"));

var _isArrayLike = _interopRequireDefault(require("./isArrayLike"));

var _toString = _interopRequireDefault(require("./toString"));

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

function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; var ownKeys = Object.keys(source); if (typeof Object.getOwnPropertySymbols === 'function') { ownKeys = ownKeys.concat(Object.getOwnPropertySymbols(source).filter(function (sym) { return Object.getOwnPropertyDescriptor(source, sym).enumerable; })); } ownKeys.forEach(function (key) { _defineProperty(target, key, source[key]); }); } return target; }

function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

var iterAt = function iterAt(index, arrayLike) {
  if (index < arrayLike.length && index >= 0) {
    return {
      value: arrayLike[index],
      index: index,
      kdx: index,
      done: false
    };
  }

  return {
    done: true
  };
};

var prevIterAt = function prevIterAt(index, arrayLike) {
  if (index < arrayLike.length && index >= 0) {
    return {
      value: arrayLike[index],
      index: index,
      kdx: index,
      done: false
    };
  }
};
/**
 * Returns iterator for an array like value.
 *
 * @function
 * @since v0.0.11
 * @category lang
 * @param {*} arrayLike The array like value to create an iterator for.
 * @param {*} index The index to start at.
 * @return {Iterator} A new iterator for the given array like value
 * @example
 *
 * arrayLikeIterator(['write', 'more'])
 * //=> {
 * //   next: () => ({
 * //     value: *,
 * //     done: boolean,
 * //     kdx: integer,
 * //     index: integer
 * //   }),
 * //   previous: () => ({
 * //     value: *,
 * //     done: boolean,
 * //     kdx: integer,
 * //     index: integer
 * //   })
 * // }
 * arrayLikeIterator('tests')
 * //=> {
 * //   next: () => ({
 * //     value: *,
 * //     done: boolean,
 * //     kdx: integer,
 * //     index: integer
 * //   })
 * //   previous: () => ({
 * //     value: *,
 * //     done: boolean,
 * //     kdx: integer,
 * //     index: integer
 * //   })
 * // }
 */


var arrayLikeIterator = function arrayLikeIterator(arrayLike) {
  var index = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;

  if (!(0, _isArrayLike.default)(arrayLike)) {
    throw new TypeError("arrayLikeIterator expected arrayLike to be an ArrayLike value. Instead received ".concat((0, _toString.default)(arrayLike)));
  }

  if (index === 'END') {
    index = arrayLike.length;
  } else if (index === 'START') {
    index = 0;
  }

  index = (0, _indexEndOffset.default)(index, arrayLike.length);
  return {
    next: function next() {
      var iter = iterAt(index, arrayLike);
      var prev = prevIterAt(index - 1, arrayLike);

      if (index < arrayLike.length) {
        index += 1;
      }

      return _objectSpread({}, iter, {
        prev: prev
      });
    },
    previous: function previous() {
      var iter = iterAt(index - 1, arrayLike);
      var prev = prevIterAt(index, arrayLike);

      if (index >= 0) {
        index -= 1;
      }

      return _objectSpread({}, iter, {
        prev: prev
      });
    }
  };
};

var _default = arrayLikeIterator;
exports.default = _default;
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