Add comprehensive frontend UI and distributed infrastructure

Frontend Enhancements:
- Complete React TypeScript frontend with modern UI components
- Distributed workflows management interface with real-time updates
- Socket.IO integration for live agent status monitoring
- Agent management dashboard with cluster visualization
- Project management interface with metrics and task tracking
- Responsive design with proper error handling and loading states

Backend Infrastructure:
- Distributed coordinator for multi-agent workflow orchestration
- Cluster management API with comprehensive agent operations
- Enhanced database models for agents and projects
- Project service for filesystem-based project discovery
- Performance monitoring and metrics collection
- Comprehensive API documentation and error handling

Documentation:
- Complete distributed development guide (README_DISTRIBUTED.md)
- Comprehensive development report with architecture insights
- System configuration templates and deployment guides

The platform now provides a complete web interface for managing the distributed AI cluster
with real-time monitoring, workflow orchestration, and agent coordination capabilities.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/node_modules/recharts-scale/lib/getNiceTickValues.js

@@ -0,0 +1,317 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.getTickValuesFixedDomain = exports.getTickValues = exports.getNiceTickValues = void 0;
+
+var _decimal = _interopRequireDefault(require("decimal.js-light"));
+
+var _utils = require("./util/utils");
+
+var _arithmetic = _interopRequireDefault(require("./util/arithmetic"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+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 _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 _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _unsupportedIterableToArray(arr, i) || _nonIterableRest(); }
+
+function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure 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 _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; }
+
+function _iterableToArrayLimit(arr, i) { if (typeof Symbol === "undefined" || !(Symbol.iterator in Object(arr))) return; var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"] != null) _i["return"](); } finally { if (_d) throw _e; } } return _arr; }
+
+function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }
+
+/**
+ * Calculate a interval of a minimum value and a maximum value
+ *
+ * @param  {Number} min       The minimum value
+ * @param  {Number} max       The maximum value
+ * @return {Array} An interval
+ */
+function getValidInterval(_ref) {
+  var _ref2 = _slicedToArray(_ref, 2),
+      min = _ref2[0],
+      max = _ref2[1];
+
+  var validMin = min,
+      validMax = max; // exchange
+
+  if (min > max) {
+    validMin = max;
+    validMax = min;
+  }
+
+  return [validMin, validMax];
+}
+/**
+ * Calculate the step which is easy to understand between ticks, like 10, 20, 25
+ *
+ * @param  {Decimal} roughStep        The rough step calculated by deviding the
+ * difference by the tickCount
+ * @param  {Boolean} allowDecimals    Allow the ticks to be decimals or not
+ * @param  {Integer} correctionFactor A correction factor
+ * @return {Decimal} The step which is easy to understand between two ticks
+ */
+
+
+function getFormatStep(roughStep, allowDecimals, correctionFactor) {
+  if (roughStep.lte(0)) {
+    return new _decimal.default(0);
+  }
+
+  var digitCount = _arithmetic.default.getDigitCount(roughStep.toNumber()); // The ratio between the rough step and the smallest number which has a bigger
+  // order of magnitudes than the rough step
+
+
+  var digitCountValue = new _decimal.default(10).pow(digitCount);
+  var stepRatio = roughStep.div(digitCountValue); // When an integer and a float multiplied, the accuracy of result may be wrong
+
+  var stepRatioScale = digitCount !== 1 ? 0.05 : 0.1;
+  var amendStepRatio = new _decimal.default(Math.ceil(stepRatio.div(stepRatioScale).toNumber())).add(correctionFactor).mul(stepRatioScale);
+  var formatStep = amendStepRatio.mul(digitCountValue);
+  return allowDecimals ? formatStep : new _decimal.default(Math.ceil(formatStep));
+}
+/**
+ * calculate the ticks when the minimum value equals to the maximum value
+ *
+ * @param  {Number}  value         The minimum valuue which is also the maximum value
+ * @param  {Integer} tickCount     The count of ticks
+ * @param  {Boolean} allowDecimals Allow the ticks to be decimals or not
+ * @return {Array}                 ticks
+ */
+
+
+function getTickOfSingleValue(value, tickCount, allowDecimals) {
+  var step = 1; // calculate the middle value of ticks
+
+  var middle = new _decimal.default(value);
+
+  if (!middle.isint() && allowDecimals) {
+    var absVal = Math.abs(value);
+
+    if (absVal < 1) {
+      // The step should be a float number when the difference is smaller than 1
+      step = new _decimal.default(10).pow(_arithmetic.default.getDigitCount(value) - 1);
+      middle = new _decimal.default(Math.floor(middle.div(step).toNumber())).mul(step);
+    } else if (absVal > 1) {
+      // Return the maximum integer which is smaller than 'value' when 'value' is greater than 1
+      middle = new _decimal.default(Math.floor(value));
+    }
+  } else if (value === 0) {
+    middle = new _decimal.default(Math.floor((tickCount - 1) / 2));
+  } else if (!allowDecimals) {
+    middle = new _decimal.default(Math.floor(value));
+  }
+
+  var middleIndex = Math.floor((tickCount - 1) / 2);
+  var fn = (0, _utils.compose)((0, _utils.map)(function (n) {
+    return middle.add(new _decimal.default(n - middleIndex).mul(step)).toNumber();
+  }), _utils.range);
+  return fn(0, tickCount);
+}
+/**
+ * Calculate the step
+ *
+ * @param  {Number}  min              The minimum value of an interval
+ * @param  {Number}  max              The maximum value of an interval
+ * @param  {Integer} tickCount        The count of ticks
+ * @param  {Boolean} allowDecimals    Allow the ticks to be decimals or not
+ * @param  {Number}  correctionFactor A correction factor
+ * @return {Object}  The step, minimum value of ticks, maximum value of ticks
+ */
+
+
+function calculateStep(min, max, tickCount, allowDecimals) {
+  var correctionFactor = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : 0;
+
+  // dirty hack (for recharts' test)
+  if (!Number.isFinite((max - min) / (tickCount - 1))) {
+    return {
+      step: new _decimal.default(0),
+      tickMin: new _decimal.default(0),
+      tickMax: new _decimal.default(0)
+    };
+  } // The step which is easy to understand between two ticks
+
+
+  var step = getFormatStep(new _decimal.default(max).sub(min).div(tickCount - 1), allowDecimals, correctionFactor); // A medial value of ticks
+
+  var middle; // When 0 is inside the interval, 0 should be a tick
+
+  if (min <= 0 && max >= 0) {
+    middle = new _decimal.default(0);
+  } else {
+    // calculate the middle value
+    middle = new _decimal.default(min).add(max).div(2); // minus modulo value
+
+    middle = middle.sub(new _decimal.default(middle).mod(step));
+  }
+
+  var belowCount = Math.ceil(middle.sub(min).div(step).toNumber());
+  var upCount = Math.ceil(new _decimal.default(max).sub(middle).div(step).toNumber());
+  var scaleCount = belowCount + upCount + 1;
+
+  if (scaleCount > tickCount) {
+    // When more ticks need to cover the interval, step should be bigger.
+    return calculateStep(min, max, tickCount, allowDecimals, correctionFactor + 1);
+  }
+
+  if (scaleCount < tickCount) {
+    // When less ticks can cover the interval, we should add some additional ticks
+    upCount = max > 0 ? upCount + (tickCount - scaleCount) : upCount;
+    belowCount = max > 0 ? belowCount : belowCount + (tickCount - scaleCount);
+  }
+
+  return {
+    step: step,
+    tickMin: middle.sub(new _decimal.default(belowCount).mul(step)),
+    tickMax: middle.add(new _decimal.default(upCount).mul(step))
+  };
+}
+/**
+ * Calculate the ticks of an interval, the count of ticks will be guraranteed
+ *
+ * @param  {Number}  min, max      min: The minimum value, max: The maximum value
+ * @param  {Integer} tickCount     The count of ticks
+ * @param  {Boolean} allowDecimals Allow the ticks to be decimals or not
+ * @return {Array}   ticks
+ */
+
+
+function getNiceTickValuesFn(_ref3) {
+  var _ref4 = _slicedToArray(_ref3, 2),
+      min = _ref4[0],
+      max = _ref4[1];
+
+  var tickCount = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 6;
+  var allowDecimals = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : true;
+  // More than two ticks should be return
+  var count = Math.max(tickCount, 2);
+
+  var _getValidInterval = getValidInterval([min, max]),
+      _getValidInterval2 = _slicedToArray(_getValidInterval, 2),
+      cormin = _getValidInterval2[0],
+      cormax = _getValidInterval2[1];
+
+  if (cormin === -Infinity || cormax === Infinity) {
+    var _values = cormax === Infinity ? [cormin].concat(_toConsumableArray((0, _utils.range)(0, tickCount - 1).map(function () {
+      return Infinity;
+    }))) : [].concat(_toConsumableArray((0, _utils.range)(0, tickCount - 1).map(function () {
+      return -Infinity;
+    })), [cormax]);
+
+    return min > max ? (0, _utils.reverse)(_values) : _values;
+  }
+
+  if (cormin === cormax) {
+    return getTickOfSingleValue(cormin, tickCount, allowDecimals);
+  } // Get the step between two ticks
+
+
+  var _calculateStep = calculateStep(cormin, cormax, count, allowDecimals),
+      step = _calculateStep.step,
+      tickMin = _calculateStep.tickMin,
+      tickMax = _calculateStep.tickMax;
+
+  var values = _arithmetic.default.rangeStep(tickMin, tickMax.add(new _decimal.default(0.1).mul(step)), step);
+
+  return min > max ? (0, _utils.reverse)(values) : values;
+}
+/**
+ * Calculate the ticks of an interval, the count of ticks won't be guraranteed
+ *
+ * @param  {Number}  min, max      min: The minimum value, max: The maximum value
+ * @param  {Integer} tickCount     The count of ticks
+ * @param  {Boolean} allowDecimals Allow the ticks to be decimals or not
+ * @return {Array}   ticks
+ */
+
+
+function getTickValuesFn(_ref5) {
+  var _ref6 = _slicedToArray(_ref5, 2),
+      min = _ref6[0],
+      max = _ref6[1];
+
+  var tickCount = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 6;
+  var allowDecimals = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : true;
+  // More than two ticks should be return
+  var count = Math.max(tickCount, 2);
+
+  var _getValidInterval3 = getValidInterval([min, max]),
+      _getValidInterval4 = _slicedToArray(_getValidInterval3, 2),
+      cormin = _getValidInterval4[0],
+      cormax = _getValidInterval4[1];
+
+  if (cormin === -Infinity || cormax === Infinity) {
+    return [min, max];
+  }
+
+  if (cormin === cormax) {
+    return getTickOfSingleValue(cormin, tickCount, allowDecimals);
+  }
+
+  var step = getFormatStep(new _decimal.default(cormax).sub(cormin).div(count - 1), allowDecimals, 0);
+  var fn = (0, _utils.compose)((0, _utils.map)(function (n) {
+    return new _decimal.default(cormin).add(new _decimal.default(n).mul(step)).toNumber();
+  }), _utils.range);
+  var values = fn(0, count).filter(function (entry) {
+    return entry >= cormin && entry <= cormax;
+  });
+  return min > max ? (0, _utils.reverse)(values) : values;
+}
+/**
+ * Calculate the ticks of an interval, the count of ticks won't be guraranteed,
+ * but the domain will be guaranteed
+ *
+ * @param  {Number}  min, max      min: The minimum value, max: The maximum value
+ * @param  {Integer} tickCount     The count of ticks
+ * @param  {Boolean} allowDecimals Allow the ticks to be decimals or not
+ * @return {Array}   ticks
+ */
+
+
+function getTickValuesFixedDomainFn(_ref7, tickCount) {
+  var _ref8 = _slicedToArray(_ref7, 2),
+      min = _ref8[0],
+      max = _ref8[1];
+
+  var allowDecimals = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : true;
+
+  // More than two ticks should be return
+  var _getValidInterval5 = getValidInterval([min, max]),
+      _getValidInterval6 = _slicedToArray(_getValidInterval5, 2),
+      cormin = _getValidInterval6[0],
+      cormax = _getValidInterval6[1];
+
+  if (cormin === -Infinity || cormax === Infinity) {
+    return [min, max];
+  }
+
+  if (cormin === cormax) {
+    return [cormin];
+  }
+
+  var count = Math.max(tickCount, 2);
+  var step = getFormatStep(new _decimal.default(cormax).sub(cormin).div(count - 1), allowDecimals, 0);
+  var values = [].concat(_toConsumableArray(_arithmetic.default.rangeStep(new _decimal.default(cormin), new _decimal.default(cormax).sub(new _decimal.default(0.99).mul(step)), step)), [cormax]);
+  return min > max ? (0, _utils.reverse)(values) : values;
+}
+
+var getNiceTickValues = (0, _utils.memoize)(getNiceTickValuesFn);
+exports.getNiceTickValues = getNiceTickValues;
+var getTickValues = (0, _utils.memoize)(getTickValuesFn);
+exports.getTickValues = getTickValues;
+var getTickValuesFixedDomain = (0, _utils.memoize)(getTickValuesFixedDomainFn);
+exports.getTickValuesFixedDomain = getTickValuesFixedDomain;

frontend/node_modules/recharts-scale/lib/index.js

@@ -0,0 +1,25 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+Object.defineProperty(exports, "getTickValues", {
+  enumerable: true,
+  get: function get() {
+    return _getNiceTickValues.getTickValues;
+  }
+});
+Object.defineProperty(exports, "getNiceTickValues", {
+  enumerable: true,
+  get: function get() {
+    return _getNiceTickValues.getNiceTickValues;
+  }
+});
+Object.defineProperty(exports, "getTickValuesFixedDomain", {
+  enumerable: true,
+  get: function get() {
+    return _getNiceTickValues.getTickValuesFixedDomain;
+  }
+});
+
+var _getNiceTickValues = require("./getNiceTickValues");

frontend/node_modules/recharts-scale/lib/util/arithmetic.js

@@ -0,0 +1,115 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+
+var _decimal = _interopRequireDefault(require("decimal.js-light"));
+
+var _utils = require("./utils");
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+/**
+ * @fileOverview 一些公用的运算方法
+ * @author xile611
+ * @date 2015-09-17
+ */
+
+/**
+ * 获取数值的位数
+ * 其中绝对值属于区间[0.1, 1)， 得到的值为0
+ * 绝对值属于区间[0.01, 0.1)，得到的位数为 -1
+ * 绝对值属于区间[0.001, 0.01)，得到的位数为 -2
+ *
+ * @param  {Number} value 数值
+ * @return {Integer} 位数
+ */
+function getDigitCount(value) {
+  var result;
+
+  if (value === 0) {
+    result = 1;
+  } else {
+    result = Math.floor(new _decimal.default(value).abs().log(10).toNumber()) + 1;
+  }
+
+  return result;
+}
+/**
+ * 按照固定的步长获取[start, end)这个区间的数据
+ * 并且需要处理js计算精度的问题
+ *
+ * @param  {Decimal} start 起点
+ * @param  {Decimal} end   终点，不包含该值
+ * @param  {Decimal} step  步长
+ * @return {Array}         若干数值
+ */
+
+
+function rangeStep(start, end, step) {
+  var num = new _decimal.default(start);
+  var i = 0;
+  var result = []; // magic number to prevent infinite loop
+
+  while (num.lt(end) && i < 100000) {
+    result.push(num.toNumber());
+    num = num.add(step);
+    i++;
+  }
+
+  return result;
+}
+/**
+ * 对数值进行线性插值
+ *
+ * @param  {Number} a  定义域的极点
+ * @param  {Number} b  定义域的极点
+ * @param  {Number} t  [0, 1]内的某个值
+ * @return {Number}    定义域内的某个值
+ */
+
+
+var interpolateNumber = (0, _utils.curry)(function (a, b, t) {
+  var newA = +a;
+  var newB = +b;
+  return newA + t * (newB - newA);
+});
+/**
+ * 线性插值的逆运算
+ *
+ * @param  {Number} a 定义域的极点
+ * @param  {Number} b 定义域的极点
+ * @param  {Number} x 可以认为是插值后的一个输出值
+ * @return {Number}   当x在 a ~ b这个范围内时，返回值属于[0, 1]
+ */
+
+var uninterpolateNumber = (0, _utils.curry)(function (a, b, x) {
+  var diff = b - +a;
+  diff = diff || Infinity;
+  return (x - a) / diff;
+});
+/**
+ * 线性插值的逆运算，并且有截断的操作
+ *
+ * @param  {Number} a 定义域的极点
+ * @param  {Number} b 定义域的极点
+ * @param  {Number} x 可以认为是插值后的一个输出值
+ * @return {Number}   当x在 a ~ b这个区间内时，返回值属于[0, 1]，
+ * 当x不在 a ~ b这个区间时，会截断到 a ~ b 这个区间
+ */
+
+var uninterpolateTruncation = (0, _utils.curry)(function (a, b, x) {
+  var diff = b - +a;
+  diff = diff || Infinity;
+  return Math.max(0, Math.min(1, (x - a) / diff));
+});
+var _default = {
+  rangeStep: rangeStep,
+  getDigitCount: getDigitCount,
+  interpolateNumber: interpolateNumber,
+  uninterpolateNumber: uninterpolateNumber,
+  uninterpolateTruncation: uninterpolateTruncation
+};
+exports.default = _default;

frontend/node_modules/recharts-scale/lib/util/utils.js

@@ -0,0 +1,155 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.memoize = exports.reverse = exports.compose = exports.map = exports.range = exports.curry = exports.PLACE_HOLDER = void 0;
+
+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; }
+
+var identity = function identity(i) {
+  return i;
+};
+
+var PLACE_HOLDER = {
+  '@@functional/placeholder': true
+};
+exports.PLACE_HOLDER = PLACE_HOLDER;
+
+var isPlaceHolder = function isPlaceHolder(val) {
+  return val === PLACE_HOLDER;
+};
+
+var curry0 = function curry0(fn) {
+  return function _curried() {
+    if (arguments.length === 0 || arguments.length === 1 && isPlaceHolder(arguments.length <= 0 ? undefined : arguments[0])) {
+      return _curried;
+    }
+
+    return fn.apply(void 0, arguments);
+  };
+};
+
+var curryN = function curryN(n, fn) {
+  if (n === 1) {
+    return fn;
+  }
+
+  return curry0(function () {
+    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
+      args[_key] = arguments[_key];
+    }
+
+    var argsLength = args.filter(function (arg) {
+      return arg !== PLACE_HOLDER;
+    }).length;
+
+    if (argsLength >= n) {
+      return fn.apply(void 0, args);
+    }
+
+    return curryN(n - argsLength, curry0(function () {
+      for (var _len2 = arguments.length, restArgs = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
+        restArgs[_key2] = arguments[_key2];
+      }
+
+      var newArgs = args.map(function (arg) {
+        return isPlaceHolder(arg) ? restArgs.shift() : arg;
+      });
+      return fn.apply(void 0, _toConsumableArray(newArgs).concat(restArgs));
+    }));
+  });
+};
+
+var curry = function curry(fn) {
+  return curryN(fn.length, fn);
+};
+
+exports.curry = curry;
+
+var range = function range(begin, end) {
+  var arr = [];
+
+  for (var i = begin; i < end; ++i) {
+    arr[i - begin] = i;
+  }
+
+  return arr;
+};
+
+exports.range = range;
+var map = curry(function (fn, arr) {
+  if (Array.isArray(arr)) {
+    return arr.map(fn);
+  }
+
+  return Object.keys(arr).map(function (key) {
+    return arr[key];
+  }).map(fn);
+});
+exports.map = map;
+
+var compose = function compose() {
+  for (var _len3 = arguments.length, args = new Array(_len3), _key3 = 0; _key3 < _len3; _key3++) {
+    args[_key3] = arguments[_key3];
+  }
+
+  if (!args.length) {
+    return identity;
+  }
+
+  var fns = args.reverse(); // first function can receive multiply arguments
+
+  var firstFn = fns[0];
+  var tailsFn = fns.slice(1);
+  return function () {
+    return tailsFn.reduce(function (res, fn) {
+      return fn(res);
+    }, firstFn.apply(void 0, arguments));
+  };
+};
+
+exports.compose = compose;
+
+var reverse = function reverse(arr) {
+  if (Array.isArray(arr)) {
+    return arr.reverse();
+  } // can be string
+
+
+  return arr.split('').reverse.join('');
+};
+
+exports.reverse = reverse;
+
+var memoize = function memoize(fn) {
+  var lastArgs = null;
+  var lastResult = null;
+  return function () {
+    for (var _len4 = arguments.length, args = new Array(_len4), _key4 = 0; _key4 < _len4; _key4++) {
+      args[_key4] = arguments[_key4];
+    }
+
+    if (lastArgs && args.every(function (val, i) {
+      return val === lastArgs[i];
+    })) {
+      return lastResult;
+    }
+
+    lastArgs = args;
+    lastResult = fn.apply(void 0, args);
+    return lastResult;
+  };
+};
+
+exports.memoize = memoize;