diff --git a/src/app/components/results/ListOfNumbersExpressionView.jsx b/src/app/components/results/ListOfNumbersExpressionView.jsx
index f2932c0..f687777 100644
--- a/src/app/components/results/ListOfNumbersExpressionView.jsx
+++ b/src/app/components/results/ListOfNumbersExpressionView.jsx
@@ -31,7 +31,7 @@ class OperandView extends React.Component {
         const binaryString = formatter.padLeft(op.bin, this.props.maxBitsLegnth, '0');
         var arr = binaryString.split('');
         arr[index] = arr[index] == '0' ? '1' : '0';
-        op.update(arr.join());
+        op.update(arr.join(''));
         this.setState(op);
     }
 }
diff --git a/src/app/expression.js b/src/app/expression.js
index 64843f3..d20d9c1 100644
--- a/src/app/expression.js
+++ b/src/app/expression.js
@@ -150,7 +150,6 @@ export class Operand {
         this.bin = binary;
         this.dec = Operand.toKindString(this.value, 'dec');
         this.hex = Operand.toKindString(this.value, 'hex');
-
     }
         
     static getBitLength(num) {
diff --git a/src/app/index.jsx b/src/app/index.jsx
index 852b7e0..b020058 100644
--- a/src/app/index.jsx
+++ b/src/app/index.jsx
@@ -8,8 +8,9 @@ import AppRoot from './components/AppRoot';
 
 commands.initialize(cmd);
 
-cmd.execute('help');
-cmd.execute('1 2 3');
+cmd.execute('1');
+cmd.execute('2');
+cmd.execute('3');
 
 var root = <AppRoot appState={appState} />;
 ReactDOM.render(root, document.getElementById('root'));
\ No newline at end of file