Added day 6 challenges and first day 7 challenge

Author: raleighlittles

Day 6/Bitwise Operators.js

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+/*
+*	Return the largest value of any a & b < k in S (where a < b).
+* 	
+*	n: Set S is a sequence of distinct integers from 1 to n (i.e., {1, 2, ..., n}).
+*	k: An integer.
+*/
+function getMaxLessThanK(n, k) {
+    let maximum = 0;
+    let current = -1;
+    for (let i = 1; i < n; i++) 
+    {
+        for (let j = i + 1; j <= n; j++) 
+        {
+            current = i & j;
+            if (current < k && current > maximum) 
+            {
+                maximum = current;
+            }
+        }
+    }
+    return maximum;
+}

Day 6/JavaScript Dates.js

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+// The days of the week are: "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
+function getDayName(dateString) {
+    let dayName;
+    // Write your code here
+    
+    var day_names = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"]
+    var date = new Date(dateString);
+    
+    dayName = day_names[date.getDay()];
+    
+    return dayName;
+}

Day 7/Regular Expressions I.js

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+function regexVar() {
+    /*
+     * Declare a RegExp object variable named 're'
+     * It must match a string that starts and ends with the same vowel (i.e., {a, e, i, o, u})
+     */
+    
+    var re = RegExp(/^([aeiou]).*\1$/);
+    
+    /*
+     * Do not remove the return statement
+     */
+    return re;
+}