s-flow
diff --git a/‎algorithm/dp/pascal_triangle/pascal_triangle/data.js
-6 b/‎algorithm/dp/pascal_triangle/pascal_triangle/data.js
-6
diff --git a/‎js/app/constructor.js
-4 b/‎js/app/constructor.js
-4
diff --git a/‎js/module/data/array2d.js
+2-2 b/‎js/module/data/array2d.js
+2-2
diff --git a/‎js/module/tracer/array1d.js
+29-23 b/‎js/module/tracer/array1d.js
+29-23
@@ -4,10 +4,4 @@ for (var i = N - 1; i >= 0; i--) {
 	A[i] = new Array (N);
 }
 
-for (var i = N - 1; i >= 0; i--) {
-	for (var j = N - 1; j >= 0; j--) {
-		A[i][j] = ' ';
-	}
-}
-
 var tracer = new Array2DTracer ('Pascal\'s Triangle')._setData(A);
@@ -9,10 +9,6 @@ const {
   hideLoadingSlider
 } = require('../dom/loading_slider');
 
-const {
-  getFileDir
-} = require('../utils');
-
 const Cache = require('./cache');
 
 const state = {
 
@@ -13,8 +13,8 @@ const random = (N, M, min, max) => {
   return D;
 };
 
-const randomSorted = (N, M, min, max)=> {
-  return this.random(N, M, min, max).map(function (arr) {
+const randomSorted = (N, M, min, max) => {
+  return random(N, M, min, max).map(function (arr) {
     return arr.sort(function (a, b) {
       return a - b;
     });
 
@@ -1,39 +1,45 @@
 const Array2DTracer = require('./array2d');
 
-function Array1DTracer() {
-  return Array2DTracer.apply(this, arguments);
-}
+class Array1DTracer extends Array2DTracer {
+  static getClassName() {
+    return 'Array1DTracer';
+  }
+
+  constructor(name) {
+    super(name);
+  }
 
-Array1DTracer.prototype = $.extend(true, Object.create(Array2DTracer.prototype), {
-  constructor: Array1DTracer,
-  name: "Array1DTracer",
-  _notify: function (idx, v) {
-    Array2DTracer.prototype._notify.call(this, 0, idx, v);
+  _notify(idx, v) {
+    super._notify(0, idx, v);
     return this;
-  },
-  _denotify: function (idx) {
-    Array2DTracer.prototype._denotify.call(this, 0, idx);
+  }
+
+  _denotify(idx) {
+    super._denotify(0, idx);
     return this;
-  },
-  _select: function (s, e) {
+  }
+
+  _select(s, e) {
     if (e === undefined) {
-      Array2DTracer.prototype._select.call(this, 0, s);
+      super._select(0, s);
     } else {
-      Array2DTracer.prototype._selectRow.call(this, 0, s, e);
+      super._selectRow(0, s, e);
     }
     return this;
-  },
-  _deselect: function (s, e) {
+  }
+
+  _deselect(s, e) {
     if (e === undefined) {
-      Array2DTracer.prototype._deselect.call(this, 0, s);
+      super._deselect(0, s);
     } else {
-      Array2DTracer.prototype._deselectRow.call(this, 0, s, e);
+      super._deselectRow(0, s, e);
     }
     return this;
-  },
-  setData: function (D) {
-    return Array2DTracer.prototype.setData.call(this, [D]);
   }
-});
+
+  setData(D) {
+    return super.setData([D]);
+  }
+}
 
 module.exports = Array1DTracer;