Add function that reads from a database

Author: samuelselasi

0x05-Node_JS_basic/full_server/utils.js

@@ -0,0 +1,27 @@
+// file containing function to read from database
+const { readFile } = require('fs');
+
+module.exports = function readDatabase(filePath) {
+  const students = {};
+  return new Promise((resolve, reject) => {
+    readFile(filePath, (err, data) => {
+      if (err) {
+        reject(err);
+      } else {
+        const lines = data.toString().split('\n');
+        const noHeader = lines.slice(1);
+        for (let i = 0; i < noHeader.length; i += 1) {
+          if (noHeader[i]) {
+            const field = noHeader[i].toString().split(',');
+            if (Object.prototype.hasOwnProperty.call(students, field[3])) {
+              students[field[3]].push(field[0]);
+            } else {
+              students[field[3]] = [field[0]];
+            }
+          }
+        }
+        resolve(students);
+      }
+    });
+  });
+};