From 79f6a9acd8597deaf9d64890f78b61355d922911 Mon Sep 17 00:00:00 2001
From: Simon El Nahas Christensen <simon.el.nahas@gmail.com>
Date: Sun, 21 Jul 2019 00:48:53 +0200
Subject: [PATCH 1/2] problem 2 solution proposal

---
 problems/03.md | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)

diff --git a/problems/03.md b/problems/03.md
index f5d385a..fb5a5a2 100644
--- a/problems/03.md
+++ b/problems/03.md
@@ -10,10 +10,91 @@ with a `withdraw` command.
 ```js
 // bank.js
 
+var jsonStream = require('duplex-json-stream')
+var net = require('net')
+
+var log = [
+
+  ]
+
+
+
+function sum() {
+    return log.reduce(
+        function (accu, x) {
+            switch (x.cmd) {
+                case 'deposit':
+                    return accu + x.amount
+
+                case 'withdraw':
+                    return accu - x.amount
+                default:
+                    return accu
+            }
+        }
+        , 0)
+}
+
+
+var server = net.createServer(function (socket) {
+    socket = jsonStream(socket)
+    socket.on('data', function (msg) {
+        console.log('Bank received:', msg)
+        switch (msg.cmd){
+            case 'balance':
+                socket.write({ cmd: 'balance', balance: sum() })
+                break
+            case 'deposit':
+                log.push({cmd: 'deposit', amount: parseInt(msg.amount)})
+                socket.write({ cmd: 'balance', balance: sum() })
+                break
+            case 'withdraw':
+                log.push({cmd: 'withdraw', amount: parseInt(msg.amount)})
+                socket.write({ cmd: 'balance', balance: sum() })
+                break
+            default:
+                break
+        }
+        
+    })
+})
+
+server.listen(3876)
+
+console.log("started bank")
+
 ```
 
 ```js
 // teller.js
+var jsonStream = require('duplex-json-stream')
+var net = require('net')
+
+var client = jsonStream(net.connect(3876))
+
+client.on('data', function (msg) {
+  console.log('Teller received:', msg)
+})
+
+const args = process.argv.slice(2)
+const command = args[0]
+const amount = parseInt(args[1])
+
+switch (command){
+    case 'balance':
+        client.end({cmd: 'balance'})
+        break
+    case 'deposit':
+        client.end({cmd: 'deposit', amount: amount})
+        break
+    case 'withdraw':
+        client.end({cmd: 'withdraw'})
+        break
+    default:
+        break
+}
+
+console.log("started teller")
 
 ```
 

From aba5cc64f21c8dee4d2aa2c4bb8c67830aad5410 Mon Sep 17 00:00:00 2001
From: Simon El Nahas Christensen <simon.el.nahas@gmail.com>
Date: Sun, 21 Jul 2019 01:15:52 +0200
Subject: [PATCH 2/2] Update 03.md

---
 problems/03.md | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/problems/03.md b/problems/03.md
index fb5a5a2..2f015b8 100644
--- a/problems/03.md
+++ b/problems/03.md
@@ -35,22 +35,27 @@ function sum() {
         , 0)
 }
 
-
 var server = net.createServer(function (socket) {
     socket = jsonStream(socket)
     socket.on('data', function (msg) {
         console.log('Bank received:', msg)
+        let amount = Math.abs(parseInt(msg.amount))
         switch (msg.cmd){
             case 'balance':
                 socket.write({ cmd: 'balance', balance: sum() })
                 break
             case 'deposit':
-                log.push({cmd: 'deposit', amount: parseInt(msg.amount)})
+                log.push({cmd: 'deposit', amount: amount})
                 socket.write({ cmd: 'balance', balance: sum() })
                 break
             case 'withdraw':
-                log.push({cmd: 'withdraw', amount: parseInt(msg.amount)})
-                socket.write({ cmd: 'balance', balance: sum() })
+                if(amount<=sum()){
+                    log.push({cmd: 'withdraw', amount: amount})
+                    socket.write({ cmd: 'balance', balance: sum() })
+
+                } else {
+                    socket.write("insufficient funds")
+                }
                 break
             default:
                 break
@@ -78,7 +83,7 @@ client.on('data', function (msg) {
 
 const args = process.argv.slice(2)
 const command = args[0]
-const amount = parseInt(args[1])
+const amount = Math.abs(parseInt(args[1]))
 
 switch (command){
     case 'balance':
@@ -88,7 +93,7 @@ switch (command){
         client.end({cmd: 'deposit', amount: amount})
         break
     case 'withdraw':
-        client.end({cmd: 'withdraw'})
+        client.end({cmd: 'withdraw', amount: amount})
         break
     default:
         break