diff --git a/client.js b/client.js
index e458139..c74f23d 100644
--- a/client.js
+++ b/client.js
@@ -1,6 +1,6 @@
 'use strict';
 
-const socket = new WebSocket('ws://127.0.0.1:8000/');
+const socket = new WebSocket('ws://192.168.0.111:2000/');
 
 const user = document.getElementById('user');
 const source = document.getElementById('source');
@@ -10,6 +10,15 @@ const clients = {};
 let selectedClient = null;
 let selectedButton = null;
 let localUser = '';
+let lastsource = '';
+//переменная , для хранения старого поля, до правки изменений
+
+const insertArrayAt = (array, index, arrayToInsert) => {
+//функция присоединяет массив на определенный индекс массива
+  Array.prototype.splice.apply(array, [index, (array[index] === '') ? 1 : 0]
+    .concat(arrayToInsert));
+  return array;
+};
 
 const toElement = (html) => new DOMParser()
   .parseFromString(html, 'text/html')
@@ -18,9 +27,7 @@ const toElement = (html) => new DOMParser()
 const showSource = (clientName) => {
   selectedClient = clientName;
   const client = clients[clientName];
-  if (client) {
-    source.value = client.source;
-  }
+  if (client) source.value = client.source;
 };
 
 const addClient = (client) => {
@@ -39,12 +46,167 @@ const addClient = (client) => {
     }
   });
   clients[client.name] = { button, client, source: '' };
+
   return button;
 };
 
+const setDiff = (obj, name, type, line, data) => {
+//функция, что добавляет поведение, поле diff = {} к объекту
+  obj.diff = {
+    name,
+    operation: type,
+    line,
+    data,
+  };
+  return obj;
+};
+
+const findLine = (arr1, arr2, data) => {
+//функция для поиска нужной строки где происходит начало изменения
+  const index = arr1.findIndex(
+    (el, i) => { if (el === data[0] && el !== data[i]) return i; });
+  return index + 1;
+};
+
+const exclude = (arr1, arr2) => {
+//функция , что возвращает массив изменений, разность массивов
+  const data = [];
+  const t1 = arr1.slice();
+  const t2 = arr2.slice();
+  let del = false;
+  if (t1.length > t2.length) { //delete
+    for (let i = 0; i < t1.length; i++) {
+      const j = i + 1;
+      if (t2[i] !== t1[i]) {
+        if (t1.length === t2.length + 1 && t2[i] === t1[j]) {
+          data.push(t1[i]);
+          break;
+        }
+        if (t2[i] === '' && !del) {
+          t2.splice(i, 1);
+          del = true;
+        }
+        if (t1[i] === '' && t1.length === t2.length + 1) {
+          t1.splice(i, 1);
+        } else {
+          data.push(t1[i]);
+          t1.splice(i, 1);
+          i--;
+        }
+      }
+    }
+  } else { //add
+    for (let i = 0; i < t2.length; i++) {
+      const j = i + 1;
+      if (t2[i] !== t1[i]) {
+        if (t1.length === t2.length - 1 &&
+          t1[i] === t2[i] + t2[j] &&
+          t2[i] !== '' &&
+          t2[j] !== '') {
+          data.push(t2[i]);
+          data.push(t2[j]);
+          break;
+        }
+        if (t1[i] === '' && !del) {
+          t1.splice(i, 1);
+          del = true;
+        }
+        data.push(t2[i]);
+        t2.splice(i, 1);
+        i--;
+      }
+    }
+  }
+  return data;
+};
+const setDelta = (oldSource, newSource) => {
+//наша главная функция, в которой мы определяем , какого типа будет наша дельта
+//и что в ней будет находится
+  const Delta = {};
+  const data = exclude(oldSource, newSource); //определяем разницу
+  if (oldSource.length === 1 && oldSource[0] === '') {
+  //добавление в пустое поле
+    setDiff(Delta, localUser, 'addToEmpty', 1, newSource);
+  } else if (oldSource.length === newSource.length) {
+  //замена строки, с ней чаще всего и работаем
+    newSource.forEach((el, i) => {
+      if (el !== oldSource[i]) {
+        setDiff(Delta, localUser, 'replace', ++i, el);
+      }
+    });
+  } else if (oldSource.length < newSource.length) { //добавление
+    const l = findLine(newSource, oldSource, data);
+    //определяем строку с изменением
+    if (data.length === 1 && data[0] === '' && l !== 0) {
+    //добавленеие пустой строки
+      setDiff(Delta, localUser, 'addNewLine', l, data);
+    } else if (data.length === 2 && newSource[l - 1] === data[0]) {
+      setDiff(Delta, localUser, 'addWithReplace', l, data);
+    } else if (data.length !== 0 && l !== 0) { //нескольких строк
+      setDiff(Delta, localUser, 'add', l, data);
+    } else { //и в случаи бага, отправка всего source.value
+      setDiff(Delta, localUser, 'addWithTrouble', 1, newSource);
+    }
+  } else if (oldSource.length > newSource.length) { //удаление из поля
+    const l = findLine(oldSource, newSource, data);
+    //определяем строку с изменением
+    if (data.length === 1 && l !== 0) { //удаление строки
+      setDiff(Delta, localUser, 'deleteLine', l, data);
+    } else if (l !== 0 && newSource.length === oldSource.length - data.length) {
+    //удаление без учета энтера
+      setDiff(Delta, localUser, 'deleteWithoutEnter', l, data);
+    } else if (l !== 0 && newSource.length !== oldSource.length - data.length) {
+    //удаление с учетом энтера
+      setDiff(Delta, localUser, 'deleteWithEnter', l, data);
+    } else { //ну  и на случай бага , отправка source.value
+      setDiff(Delta, localUser, 'deleteWithTrouble', 1, newSource);
+    }
+  }
+  return Delta; //возвращаем наш объект с переводом в строку ->->->
+};
+
+const applyDeltaOBJ = {
+  'replace': (arr, obj) => { arr[this.idx] = obj.data; },
+  'replaceAll': (arr, obj) => {
+    obj.data.forEach((el, i) => {
+      arr[i] = el;
+    });
+  },
+  'add': (arr, obj) => { insertArrayAt(arr, this.idx, obj.data); },
+  'addWithReplace': (arr, obj) => {
+    arr[this.idx] = obj.data[0];
+    if (arr[this.idx + 1] === '') {
+      insertArrayAt(arr, this.idx + 1, obj.data[1]);
+      arr.splice(obj.line + 1, 0, '');
+    } else insertArrayAt(arr, this.idx + 1, obj.data[1]);
+  },
+  'addNewLine': (arr, obj) => { arr.splice(this.idx, 0, obj.data); },
+  'deleteWithTrouble': (arr, obj) => {
+    arr = [];
+    obj.data.forEach((el, i) => arr[i] = el);
+  },
+  'deleteLine': (arr) => { arr.splice(this.idx, 1); },
+  'deleteWithEnter': (arr, obj) => {
+    arr.splice(this.idx, obj.data.length, '');
+  },
+  'deleteWithoutEnter': (arr, obj) => { arr.splice(this.idx, obj.data.length); }
+};
+
+const applyDelta = (arr, obj) => {
+//функция , для применения изменений у других клиентов
+  const idx = obj.line - 1; // индекс массива
+  this.idx = idx;
+  if (obj.operation === 'addToEmpty' || obj.operation === 'addWithTrouble')
+    applyDeltaOBJ['replaceAll'](arr, obj);
+  else applyDeltaOBJ[obj.operation](arr, obj);
+  //колекция функий , для каждого случая(колекция в виде объекта)
+  return  arr.join('\n');
+};
+
 const changeSource = (edit) => {
   const client = clients[edit.name];
-  client.source = edit.value;
+  client.source = applyDelta(client.source.split('\n'), edit);
+  //в client.source мы запишем старый client.source , но с изменениями
   if (selectedClient === edit.name) {
     showSource(edit.name);
   }
@@ -65,23 +227,23 @@ user.addEventListener('keydown', (event) => {
   }
 });
 
-source.addEventListener('input', (event) => {
+source.addEventListener('input', () => {
   const client = clients[localUser];
   client.source = source.value;
-  socket.send(JSON.stringify({
-    edit: {
-      name: localUser,
-      value: source.value
-    }
-  }));
+  socket.send(JSON.stringify( //отправляем серверу нашу дельту строкой
+    setDelta(lastsource.split('\n'), client.source.split('\n'))
+    //в setDelta передаем массивы строк, так удобнее вычислять отличия
+  ));
+  lastsource = client.source;
+  // запишем в lastsource текущее поле, и когда мы снова будем вычислять дельту,
+  // у нас будет два поля, до изменений и после
 });
 
 socket.onmessage = (event) => {
   const change = JSON.parse(event.data);
-  console.log(event.data);
   if (change.client) {
     addClient(change.client);
-  } else if (change.edit) {
-    changeSource(change.edit);
+  } else if (change.diff) {
+    changeSource(change.diff);
   }
 };
diff --git a/index.html b/index.html
index 672192f..a036a34 100644
--- a/index.html
+++ b/index.html
@@ -7,7 +7,6 @@
 <div id="settings">Name: <input id="user" type="text"  class="edit"></div>
 <div id="buttons"></div>
 <textarea id="source" class="edit">
-'use strict';
 </textarea>
 <script src="client.js"></script>
 </body>
diff --git a/package-lock.json b/package-lock.json
index f72c7d9..f2ed89d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,9 +1,284 @@
 {
-  "name": "metacode",
+  "name": "livecoding",
   "version": "0.1.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "acorn": {
+      "version": "5.6.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.6.1.tgz",
+      "integrity": "sha512-XH4o5BK5jmw9PzSGK7mNf+/xV+mPxQxGZoeC36OVsJZYV77JAG9NnI7T90hoUpI/C1TOfXWTvugRdZ9ZR3iE2Q==",
+      "dev": true
+    },
+    "acorn-jsx": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz",
+      "integrity": "sha1-r9+UiPsezvyDSPb7IvRk4ypYs2s=",
+      "dev": true,
+      "requires": {
+        "acorn": "3.3.0"
+      },
+      "dependencies": {
+        "acorn": {
+          "version": "3.3.0",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
+          "integrity": "sha1-ReN/s56No/JbruP/U2niu18iAXo=",
+          "dev": true
+        }
+      }
+    },
+    "ajv": {
+      "version": "5.5.2",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.5.2.tgz",
+      "integrity": "sha1-c7Xuyj+rZT49P5Qis0GtQiBdyWU=",
+      "dev": true,
+      "requires": {
+        "co": "4.6.0",
+        "fast-deep-equal": "1.1.0",
+        "fast-json-stable-stringify": "2.0.0",
+        "json-schema-traverse": "0.3.1"
+      }
+    },
+    "ajv-keywords": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-2.1.1.tgz",
+      "integrity": "sha1-YXmX/F9gV2iUxDX5QNgZ4TW4B2I=",
+      "dev": true
+    },
+    "ansi-escapes": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.1.0.tgz",
+      "integrity": "sha512-UgAb8H9D41AQnu/PbWlCofQVcnV4Gs2bBJi9eZPxfU/hgglFh3SMDMENRIqdr7H6XFnXdoknctFByVsCOotTVw==",
+      "dev": true
+    },
+    "ansi-regex": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+      "dev": true
+    },
+    "ansi-styles": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
+      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
+      "dev": true
+    },
+    "argparse": {
+      "version": "1.0.10",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
+      "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
+      "dev": true,
+      "requires": {
+        "sprintf-js": "1.0.3"
+      }
+    },
+    "array-union": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/array-union/-/array-union-1.0.2.tgz",
+      "integrity": "sha1-mjRBDk9OPaI96jdb5b5w8kd47Dk=",
+      "dev": true,
+      "requires": {
+        "array-uniq": "1.0.3"
+      }
+    },
+    "array-uniq": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/array-uniq/-/array-uniq-1.0.3.tgz",
+      "integrity": "sha1-r2rId6Jcx/dOBYiUdThY39sk/bY=",
+      "dev": true
+    },
+    "arrify": {
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+      "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0=",
+      "dev": true
+    },
+    "babel-code-frame": {
+      "version": "6.26.0",
+      "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
+      "integrity": "sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=",
+      "dev": true,
+      "requires": {
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+        "esutils": "2.0.2",
+        "js-tokens": "3.0.2"
+      },
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+          "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
+          "dev": true,
+          "requires": {
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+            "escape-string-regexp": "1.0.5",
+            "has-ansi": "2.0.0",
+            "strip-ansi": "3.0.1",
+            "supports-color": "2.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+          "dev": true,
+          "requires": {
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+          }
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+      "requires": {
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+        "concat-map": "0.0.1"
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+    "buffer-from": {
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+      "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.0.tgz",
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+      "dev": true
+    },
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+      "integrity": "sha1-lAhe9jWB7NPaqSREqP6U6CV3dR8=",
+      "dev": true,
+      "requires": {
+        "callsites": "0.2.0"
+      }
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+      "resolved": "https://registry.npmjs.org/callsites/-/callsites-0.2.0.tgz",
+      "integrity": "sha1-r6uWJikQp/M8GaV3WCXGnzTjUMo=",
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+      "integrity": "sha512-ObN6h1v2fTJSmUXoS3nMQ92LbDK9be4TV+6G+omQlGJFdcUX5heKi1LZ1YnRMIgwTLEj3E24bT6tYni50rlCfQ==",
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+        "escape-string-regexp": "1.0.5",
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+          }
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+          }
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+      "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ=",
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+    },
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+      "requires": {
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+      }
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+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
+      "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=",
+      "dev": true
+    },
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+      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
+      "dev": true
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+      "dev": true,
+      "requires": {
+        "buffer-from": "1.1.0",
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+      }
+    },
     "yaeti": {
       "version": "0.0.6",
       "resolved": "https://registry.npmjs.org/yaeti/-/yaeti-0.0.6.tgz",
       "integrity": "sha1-8m9ITXJoTPQr7ft2lwqhYI+/lXc="
+    },
+    "yallist": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
+      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
+      "dev": true
     }
   }
 }
diff --git a/package.json b/package.json
index 88d1ea7..8727392 100644
--- a/package.json
+++ b/package.json
@@ -7,5 +7,8 @@
   "dependencies": {
     "websocket": "1.0.x"
   },
-  "readmeFilename": "README.md"
+  "readmeFilename": "README.md",
+  "devDependencies": {
+    "eslint": "^4.19.1"
+  }
 }
diff --git a/server.js b/server.js
index 73ca8b2..bc5321d 100644
--- a/server.js
+++ b/server.js
@@ -16,8 +16,8 @@ const server = http.createServer((req, res) => {
   res.end(data);
 });
 
-server.listen(8000, () => {
-  console.log('Listen port 8000');
+server.listen(2000, () => {
+  console.log('Listen port 2000');
 });
 
 const ws = new Websocket({