Updated tests for 'Iterate through an array with a for loop' to ES6 (#19722)

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-through-an-array-with-a-for-loop.english.md

@@ -22,13 +22,13 @@ Declare and initialize a variable <code>total</code> to <code>0</code>. Use a <c
 ```yml
 tests:
   - text: <code>total</code> should be declared and initialized to 0
-    testString: assert(code.match(/var.*?total\s*=\s*0.*?;/), '<code>total</code> should be declared and initialized to 0');
+    testString: assert(code.match(/(var|let|const)\s*?total\s*=\s*0.*?;?/), '<code>total</code> should be declared and initialized to 0');
   - text: <code>total</code> should equal 20
     testString: assert(total === 20, '<code>total</code> should equal 20');
   - text: You should use a <code>for</code> loop to iterate through <code>myArr</code>
     testString: assert(code.match(/for\s*\(/g).length > 1 && code.match(/myArr\s*\[/), 'You should use a <code>for</code> loop to iterate through <code>myArr</code>');
   - text: Do not set <code>total</code> to 20 directly
-    testString: assert(!code.match(/total[\s\+\-]*=\s*(\d(?!\s*[;,])|[1-9])/g), 'Do not set <code>total</code> to 20 directly');
+    testString: assert(!code.match(/total[\s\+\-]*=\s*(0(?!\s*[;,]?$)|[1-9])/gm), 'Do not set <code>total</code> to 20 directly');
 
 ```
 
@@ -64,6 +64,7 @@ var myArr = [ 2, 3, 4, 5, 6];
 
 ```js
 (function(){if(typeof total !== 'undefined') { return "total = " + total; } else { return "total is undefined";}})()
+
 ```
 
 </div>