working version

src/fibonacci.js

@@ -18,7 +18,17 @@ function fibsRec (number) {
     return number === 1 ? [0 , 1] : fibsRec(number - 1).concat(fibsRec(number -1)[fibsRec(number - 1).length - 1] + fibsRec(number -1)[fibsRec(number - 1).length - 2]);
 }
 
-console.log("Using iterative fibs function:");
-console.log(fibs(8));
-console.log("Using recursive fibsRec function:");
-console.log(fibsRec(8));
+// get input from user
+const readline = require('readline').createInterface({
+    input: process.stdin,
+    output: process.stdout
+});
+
+readline.question('Enter amount of Fibonacci numbers to display: ', number => {
+    console.log("Using iterative fibs function:");
+    console.log(fibs(number));
+    console.log("Using recursive fibsRec function:");
+    console.log(fibsRec(number));
+    readline.close();
+});
+

src/mergeSort.js

@@ -0,0 +1,29 @@
+// merge sort - recursive
+function mergeSort (arr) {
+    if (arr.length < 2) return arr;
+    // the sauce
+    function mergeArrays (left, right) {
+        // create output array
+        let output = [];
+        // while both halves of the array have values
+        while (left.length && right.length) {
+            // remove first index from correct array and add to output array
+            left[0] <= right[0] ? output.push(left.shift()) : output.push(right.shift());
+        }
+        return output.concat(left, right);
+    }
+    const half = Math.floor(arr.length / 2);
+    const left = arr.splice(0, half);
+    return mergeArrays(mergeSort(left), mergeSort(arr));
+}
+
+// get input from user
+const readline = require('readline').createInterface({
+    input: process.stdin,
+    output: process.stdout
+});
+
+readline.question('Enter comma-separated numbers to sort: ', numbers => {
+    numbers.indexOf(',') > -1 ? console.log (mergeSort([numbers])) : console.log ('No comma-separated numbers entered!');
+    readline.close();
+});