From a925aaaafd54ccfc7ec8b0b6e3f32617a50223ee Mon Sep 17 00:00:00 2001
From: Dan Zygmund-Felt <d.zygmund.felt@gmail.com>
Date: Thu, 25 May 2017 09:50:45 -0400
Subject: [PATCH] Wrote zipperArray and largestConcatenatedNumber methods.

---
 index.html   |  4 ++--
 js/script.js | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 62 insertions(+), 3 deletions(-)

diff --git a/index.html b/index.html
index ef273b7..51075b8 100755
--- a/index.html
+++ b/index.html
@@ -20,8 +20,8 @@ <h1>Loops Exercises</h1>
 
     <section id="menu">
       <ul>
-        <li><button type="button" class="btn btn-primary" onclick="yourFunctionName()">Example 3.1</button></li>
-        <li><button type="button" class="btn btn-primary" onclick="yourFunctionName()">Example 3.2</button></li>
+        <li><button type="button" class="btn btn-primary" onclick="zipperArray()">Example 3.1</button></li>
+        <li><button type="button" class="btn btn-primary" onclick="largestConcatenatedNumber()">Example 3.2</button></li>
       </ul>
     </section>
 
diff --git a/js/script.js b/js/script.js
index c36bf4a..3e75d47 100755
--- a/js/script.js
+++ b/js/script.js
@@ -10,4 +10,63 @@ function example(){
   var v = 3 +4;
   
   display.innerHTML = v;
-}
\ No newline at end of file
+}
+
+function zipperArray() {
+	var a = [], b = [], retArray = [];
+	var size = prompt("How long are your arrays?")
+	for(_i = 0; _i < size; _i++) {
+		a[_i] = prompt("entry element " + _i + " from array 1")
+	}
+	for(_j = 0; _j < size; _j++) {
+		b[_j] = prompt("enter element " + _j + " from array 2")
+	}
+	for(i = 0; i < size; i++) {
+		retArray[2*i] = a[i]
+		retArray[2*i + 1] = b[i]
+	}
+	display.innerHTML = retArray
+}
+
+function largestConcatenatedNumber() {
+	var size = prompt("How long is your array?")
+	var arr = []
+	for(_i = 0; _i < size; _i++) {
+		arr[_i] = prompt("enter element " + _i)
+	}
+	var permArray = recursivePermutator(arr)
+	var max = 0
+	for(i = 0; i < permArray.length; i++) {
+		str = ""
+		for(j = 0; j < size; j++) {
+			str += permArray[i][j]
+		}
+		if(str > max) {
+			max = str
+		}
+	}
+	display.innerHTML = max
+}
+
+//https://stackoverflow.com/questions/9960908/permutations-in-javascript
+function recursivePermutator(arr) {
+	var permArr = []
+	var usedNumbers = []
+
+	function permute(arr) {
+	  var i, ch;
+	  for (i = 0; i < arr.length; i++) {
+	    ch = arr.splice(i, 1)[0];
+	    usedNumbers.push(ch);
+	    if (arr.length == 0) {
+	      permArr.push(usedNumbers.slice());
+	    }
+	    permute(arr);
+	    arr.splice(i, 0, ch);
+	    usedNumbers.pop();
+	  }
+	  return permArr
+	};
+
+	return permute(arr)
+}	
\ No newline at end of file