challenge completed

challenges/Backend_Challenge/.gitignore

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+node_modules

challenges/Backend_Challenge/README.md

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+# Backend Challenge for Headstorm
+
+By Philip Kaufholz
+
+
+# Introduction
+
+Javascript program that uses Node.js Express to host a local server that implements the REST API as specified in the challenge writeup.
+
+POSTing a list of 500 numbers to /data will sort the list and become accessible through a GET call. Posting a list that isn't 500 numbers will return an error. The "bonus" PATCH functionality is also implemented, sorting the new element into the existing list.
+
+Note that a sample list isn't there on load, so using the GET endpoint before POSTing a list will show that no list has been uploaded.
+
+# How to run
+
+1. install node packages ('npm install' in console)
+2. run 'node index.js' in console. Server hosted on port 3000 by default.
+3. To make REST calls, suggested to use a GUI like Postman or Reqbin (what I used for testing) https://reqbin.com/ .
+

challenges/Backend_Challenge/data.js

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+
+var L = [];
+
+for (var i=0, t = 499; i<500; i++) {
+    L.push(Math.round(Math.random() * t))
+}
+
+console.log(JSON.stringify(L))

challenges/Backend_Challenge/index.js

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+
+//Import in required packages
+var express = require('express');
+var bodyParser = require('body-parser');
+var multer = require('multer');
+var upload = multer();
+var app = express();
+
+//Initialize app middleware
+app.use(bodyParser.urlencoded({ extended: true }));
+app.use(bodyParser.json())
+app.use(upload.array());
+
+var stored_data = []
+
+//Used for sorting list
+function intCompare(a, b) {
+    if (a < b) {
+      return -1;
+    }
+    if (a > b) {
+      return 1;
+    }
+    return 0;
+  }
+
+//GET for /data endpoint, if no POST has been made then a message is returned instead.
+//If there is stored data from a previous post, the list is sorted before it is returned.
+app.get('/data', function(req, res){
+    if (stored_data.length === 0) {
+        res.send("No data uploaded yet!")
+    }
+    else {
+        stored_data.sort(intCompare)
+        res.json({"data" : stored_data})
+    }
+});
+
+//POST for the /data endpoint, if the posted data isn't a list of 500 numbers return bad status and message.
+//If the data is a list of 500 numbers, then the data is stored and available to GET calls at this endpoint.
+/*Format for POST request:
+{
+  "data" : [145,48,171,495 .... 61,355,284,294]
+}
+May have to include header: 'Content-Type: application/json'
+*/
+app.post('/data', function(req, res){
+   console.log(req.body.data)
+   var req_data = req.body.data
+   console.log(req_data.length)
+   if (req_data.length != 500) {
+        res.status(400);
+        res.send("Bad request, not length 500");
+   }
+   else {
+       var allNums = true
+       for (i = 0; i < 500; i++) {
+            if (typeof(req_data[i]) != "number") {
+                console.log("found a false one!", typeof(req_data[i]))
+                allNums = false
+            }}
+       if (!allNums) {
+        res.status(400);
+        res.send("Bad request, not all numbers");
+        res.end()
+       }
+       else {
+        stored_data = req_data
+        res.json({message: "List updated with POST request"})
+        res.status(201);
+        res.end()
+       }
+}});
+
+//PATCH for the /data endpoint. Takes in a single number, which is sorted into the list and sent back. Malformed requests
+//cause an error.
+/*Format for PATCH request:
+{
+    "num" : 100
+}
+May have to include header: 'Content-Type: application/json'
+*/
+app.patch('/data', function(req, res){
+    console.log(req.body.data)
+    var req_num = req.body.num
+    if (typeof(req_num) != "number") {
+        res.status(400);
+        res.send("Bad request, not a number");
+        res.end()       
+    }
+    else {
+        stored_data.push(req_num)
+        stored_data.sort(intCompare)
+        res.json({ "message": "Patch made! Result:",
+                   "data" : stored_data 
+                 })
+    }
+ });
+
+
+app.get('/', function (req, res) {
+    res.send('GET request to the homepage')
+  })
+
+app.post('/', function (req, res) {
+    res.send('POST request to the homepage')
+  })
+
+
+//Start server
+app.listen(3000, () => {
+    console.log('Server is running')
+  })
+
+
+
+
+
+
+/* Example REST calls */
+
+//fetch('/').then(res => res.then(data => console.log(data)))
+
+//fetch('/', {method : "POST"}).then(res => res.then(data => console.log(data)))
+
+
+
+
+
+/*
+
+{
+    "num" : 100
+}
+
+{
+  "data" : [145,395,184,425,147,487,234,308,236,393,169,7,262,11,31,319,336,263,56,56,359,164,491,123,168,13,248,171,495,335,151,206,258,90,398,376,304,448,393,92,209,397,404,454,307,212,434,253,434,53,229,493,482,314,441,119,3,72,405,33,259,21,99,213,211,114,335,178,259,358,431,386,283,166,398,148,224,221,233,185,243,265,12,307,163,449,143,36,69,73,280,212,55,440,170,208,258,131,76,195,204,272,496,261,37,261,90,432,351,225,447,442,278,70,495,28,122,36,260,140,46,432,387,485,449,498,339,242,437,357,183,158,451,61,85,448,270,279,310,187,139,320,145,72,242,427,219,192,348,323,50,354,418,212,6,289,297,184,195,46,283,313,229,91,465,455,236,277,55,368,249,3,313,200,490,147,429,100,113,207,367,399,455,369,356,100,332,313,481,68,165,4,305,232,407,190,490,374,174,165,332,157,487,116,285,67,42,254,15,395,426,96,328,488,211,493,61,102,178,51,115,49,337,256,394,458,20,407,113,478,288,116,492,488,122,208,60,129,337,333,288,6,446,39,62,297,81,356,363,346,478,240,152,184,78,292,324,341,306,448,60,400,456,437,481,150,70,430,379,468,385,406,260,278,80,315,286,286,346,2,84,239,160,24,14,65,130,192,61,137,37,424,317,393,357,107,152,277,440,476,235,296,192,58,239,150,69,109,7,481,76,101,323,452,73,150,418,419,460,99,239,344,335,453,130,384,252,238,292,179,407,67,336,493,193,68,179,171,422,155,265,271,187,178,9,52,463,290,296,326,177,104,240,339,14,32,278,93,215,297,44,257,50,11,14,151,302,41,147,181,206,3,81,237,70,456,423,181,233,375,109,165,264,294,443,187,204,315,428,260,328,52,149,176,169,103,442,442,92,429,402,97,388,453,44,25,217,101,484,48,341,197,474,7,270,445,457,496,345,183,447,333,210,483,486,301,161,197,17,474,345,340,481,114,438,133,13,127,69,45,50,56,487,262,352,425,428,1,39,323,229,268,438,231,138,479,405,92,86,444,155,352,285,459,264,461,434,342,286,429,359,492,303,66,108,401,172,355,280,116,204,8,350,168,91,469,405,323,498,139,439,252,347,146,144,323,61,355,284,294]
+
+}
+
+*/