add comment lines to explain funnctions

App.js

@@ -23,6 +23,9 @@ export default class App extends Component {
     this.checkWallet();
   }
 
+  /**
+   * @method to check wallet in Localstorage 
+   */
   async checkWallet() {
     try {
       const value = await AsyncStorage.getItem('account');

src/containers/Browser/index.js

@@ -1,7 +1,10 @@
 import React, { Component } from 'react';
 import { View, Text, SafeAreaView } from 'react-native';
 
-class SendETH extends Component {
+/**
+ * @class DAppBrowser
+ */
+class DAppBrowser extends Component {
   constructor(props) {
     super(props);
     this.state = {
@@ -17,4 +20,4 @@ class SendETH extends Component {
   }
 }
 
-export default SendETH;
+export default DAppBrowser;

src/containers/ETHWallet/index.js

@@ -2,6 +2,9 @@ import React, { Component } from 'react';
 import { View, Text, SafeAreaView, AsyncStorage } from 'react-native';
 import QRCode from 'react-native-qrcode-svg';
 
+/**
+ * @class ETH Wallet
+ */
 class ETHWallet extends Component {
   constructor(props) {
     super(props);
@@ -12,6 +15,9 @@ class ETHWallet extends Component {
     };
   }
 
+  /**
+   * @method to get wallet from localstorage
+   */
   async componentDidMount() {
     let wallet = await AsyncStorage.getItem('account');
     wallet = JSON.parse(wallet);

src/containers/Home/index.js

@@ -48,6 +48,9 @@ class Home extends Component {
     this.checkWallet();
   }
 
+  /**
+   * @method to check wallet in localstorage
+   */
   async checkWallet() {
     try {
       const value = await AsyncStorage.getItem('account');
@@ -63,6 +66,9 @@ class Home extends Component {
     }
   }
 
+  /**
+   * @method to fetch balance of wallet
+   */
   async getETHBalance() {
     let balance = await web3.eth.getBalance(this.state.account.address);
     balance = web3.utils.fromWei(balance, 'ether');

src/containers/SendETH/index.js

@@ -44,6 +44,9 @@ class SendEther extends Component {
     this.checkWallet();
   }
 
+  /**
+   * @method to check wallet in localstorage
+   */
   async checkWallet() {
     try {
       const value = await AsyncStorage.getItem('account');
@@ -59,6 +62,9 @@ class SendEther extends Component {
     }
   }
 
+  /**
+   * @method to fetch balance of wallet
+   */  
   async getETHBalance() {
     let balance = await web3.eth.getBalance(this.state.account.address);
     balance = web3.utils.fromWei(balance, 'ether');
@@ -67,8 +73,12 @@ class SendEther extends Component {
     await this.setState({ ETHBalance: Number(balance).toFixed(3) });
   }
 
+  /**
+   * @method to transfer Ether
+   */  
   async transferEther() {
     await this.setState({ dialogVisible: false })
+    // ETH address validation
     if (this.state.receiver === undefined || this.state.receiver.length !== 42 || web3.utils.isAddress(this.state.receiver) === false ) {
       Alert.alert(
         'Wrong Ethereum Address!',
@@ -100,6 +110,7 @@ class SendEther extends Component {
     };
 
     let tx = new EthereumTx(rawTransaction);
+    // sign transaction with private key
     tx.sign(privateKey);
     let serializedTx = tx.serialize();
 
@@ -111,6 +122,7 @@ class SendEther extends Component {
       ]
     );
 
+    // Send signed transaction to Ethereum blockchain
     web3.eth.sendSignedTransaction('0x' + serializedTx.toString('hex')).then(result => {
       console.log(result);
 
@@ -122,7 +134,6 @@ class SendEther extends Component {
         ]
       );
     }).catch(error => {
-      console.log(typeof error);
       console.log(error);
       this.setState({ error, receiver: undefined });
 

src/containers/Settings/index.js

@@ -12,17 +12,23 @@ class Settings extends Component {
     super(props);
     this.state = {
     };
-    this.showWallet = this.showWallet.bind(this);
+    this.copyToClipboard = this.copyToClipboard.bind(this);
     this.deleteWallet = this.deleteWallet.bind(this);
   }
 
-  async showWallet() {
+  /**
+   * @method to export the private key by copying it to Clipboard
+   */
+  async copyToClipboard() {
     let wallet = await AsyncStorage.getItem('account');
     wallet = JSON.parse(wallet);
     Clipboard.setString(wallet.privateKey);
     alert('Your private key is copied to the clipboard.');
   }
 
+  /**
+   * @method to delete whole information(includes wallet)
+   */
   async deleteWallet() {
     await AsyncStorage.removeItem('account');
     const resetAction = StackActions.reset({
@@ -35,7 +41,7 @@ class Settings extends Component {
   render() {
     return (
       <View style={styles.container}>
-        <TouchableOpacity style={{ width: '100%', alignSelf: 'center' }} onPress={() => { this.showWallet() }}>
+        <TouchableOpacity style={{ width: '100%', alignSelf: 'center' }} onPress={() => { this.copyToClipboard() }}>
           <Card.Body style={styles.card}>
             <View style={{ paddingVertical: 20 }} >
               <Text style={{ color: '#fff', fontSize: 20, textAlign: 'center', fontWeight: 'bold' }}> Backup Wallet </Text>

src/containers/Welcome/index.js

@@ -27,16 +27,21 @@ class Welcome extends Component {
 
   componentDidMount() {
     console.log(this.props);
-    //AsyncStorage.clear();
   }
 
+  /**
+   * @method to create new Ethereum wallet
+   */
   createWallet = async () => {
     const account = await web3.eth.accounts.create();
     console.log(account);
     await this.setState({ account });
     this.storeData();
   }
 
+  /**
+   * @method to store wallet info in localstorage
+   */
   storeData = async () => {
     try {
       await AsyncStorage.setItem('account', JSON.stringify(this.state.account));
@@ -47,6 +52,9 @@ class Welcome extends Component {
     }
   };
 
+  /**
+   * @method to retrieve wallet info from localstorage
+   */
   async retrieveData() {
     try {
       const value = await AsyncStorage.getItem('account');
@@ -56,6 +64,9 @@ class Welcome extends Component {
     }
   };
 
+  /**
+   * @method to restore Ethereum wallet from private key
+   */
   async restoreWallet() {
     console.log(this.state);