some solution updates to arrays and best practices section

app/arrays.js

@@ -2,15 +2,24 @@ exports = typeof window === 'undefined' ? global : window;
 
 exports.arraysAnswers = {
   indexOf: function(arr, item) {
-
+    return arr.indexOf(item);
   },
 
   sum: function(arr) {
-
+    var total = 0;
+    for(var i=0; arr.length > i; i++) {
+      total += arr[i];
+    }
+    return total;
   },
 
   remove: function(arr, item) {
-
+    var index = arr.indexOf(item);
+    while(index >=0) {
+      arr.splice(index,1);
+      index = arr.indexOf(item);
+    }
+    return arr;
   },
 
   removeWithoutCopy: function(arr, item) {

app/bestPractices.js

@@ -9,6 +9,7 @@ exports = typeof window === 'undefined' ? global : window;
 
 exports.bestPracticesAnswers = {
   globals: function() {
+    var myObject;
     myObject = {
       name: 'Jory'
     };
@@ -17,10 +18,10 @@ exports.bestPracticesAnswers = {
   },
 
   parseInt: function(num) {
-    return parseInt(num);
+    return parseInt(num, 10);
   },
 
   identity: function(val1, val2) {
-
+    return val1 === val2;
   }
 };

app/strings.js

@@ -2,7 +2,20 @@ exports = typeof window === 'undefined' ? global : window;
 
 exports.stringsAnswers = {
   reduceString: function(str, amount) {
-
+    var count = 0;
+    var result = '';
+    for(var i = 0; i < str.length; i++) {
+      if (str[i] === str[i+1]) {
+        count++
+        if(count < amount) {
+          result += str[i];
+        }
+      } else {
+        count = 0;
+        result += str[i];
+      }
+    };
+    return result;
   },
 
   wordWrap: function(str, cols) {