Update Counting Minutes I

Author: ratracegrad

Counting Minutes I

@@ -1,17 +1,66 @@
-Using the JavaScript language, have the function CountingMinutesI(str) take the str parameter being passed which will be two times (each properly formatted with a colon and am or pm) separated by a hyphen and return the total number of minutes between the two times. The time will be in a 12 hour clock format. For example: if str is 9:00am-10:00am then the output should be 60. If str is 1:00pm-11:00am the output should be 1320. 
+/***************************************************************************************
+*                                                                                      *
+*                  CODERBYTE BEGINNER CHALLENGE                                        *
+*                                                                                      *
+*  Counting Minutes I                                                                  *
+*  Using the JavaScript language, have the function CountingMinutesI(str) take the     *
+*  str parameter being passed which will be two times (each properly formatted with    *
+*  a colon and am or pm) separated by a hyphen and return the total number of minutes  *
+*  between the two times. The time will be in a 12 hour clock format. For example:     *
+*  if str is 9:00am-10:00am then the output should be 60. If str is 1:00pm-11:00am     *
+*  the output should be 1320.                                                          *
+*                                                                                      *
+*  SOLUTION                                                                            *
+*  Sometimes it pays to spend more time mapping out all the possibilites you might     *
+*  face in solving a problem before you start programming. This challenge will have    *
+*  4 possible scenarios. They are:                                                     *
+*    a) both have same ampm values and first time is after second time                 *
+*    b) both have same ampm values and the first time is before second time            *
+*    c) have different ampm times and time1 is am                                      *
+*    d) have different ampm times and time2 is pm                                      *
+*                                                                                      *
+*  I am going to use an object to represent both times simply because I like to use    *
+*  words like hours, mins, and ampm instead of referring to an array index. To parse   *
+*  the str into the two time objects I created a separate function. Now that I have    *
+*  my 2 time object I just need to create a series of IF statements to correspond to   *
+*  the 4 scenarios listed above to calculate the timeDiff.                             *
+*                                                                                      *
+*  Steps for solution                                                                  *
+*    1) Use RegExp pattern to search string for pattern a...b                          *
+*    2) If found return true                                                           *
+*    3) Else return false                                                              *
+*                                                                                      *
+***************************************************************************************/
 function CountingMinutesI(str) { 
+    var time1Obj = {}, time2Obj = {}, timeDiff;
+    
+    time1Obj = setTimeObject(str, 0);
+    time2Obj = setTimeObject(str, 1);
+    
+    if (time1Obj.ampm == time2Obj.ampm && time1Obj.tot > time2Obj.tot) {
+        timeDiff = (((12 - time1Obj.hours + 12) * 60) - (time1Obj.mins)) + ((time2Obj.hours * 60) + time2Obj.mins);
+    } 
+    else if (time1Obj.ampm == time2Obj.ampm && time1Obj.tot < time2Obj.tot) {
+        timeDiff = ((time2Obj.hours * 60) + time2Obj.mins) - ((time1Obj.hours * 60) + time1Obj.mins);
+    }
+    else if (time1Obj.ampm !== time2Obj.ampm && time1Obj.ampm === "am") {
+        timeDiff = (((12 - time1Obj.hours) * 60) - time1Obj.mins) + ((time2Obj.hours * 60) + time2Obj.mins);
+    }
+    else { 
+        timeDiff = (((12 - time1Obj.hours) * 60) - time1Obj.mins) + ((time2Obj.hours * 60) + time2Obj.mins);
+    }
 
-  // code goes here  
-  return 690; 
-         
+    return timeDiff;
+}
+    
+function setTimeObject(str, num) {
+    var arr = str.split("-");
+    var tObject = {};
+    
+    tObject.hours = Number(arr[num].slice(0,arr[num].length-2).split(":")[0]);
+    tObject.mins = Number(arr[num].slice(0,arr[num].length-2).split(":")[1]);
+    tObject.ampm = arr[num].slice(-2);
+    tObject.tot = tObject.hours * 100 + tObject.mins;
+    
+    return tObject;
 }
-
-1. When the input was "1:00pm-11:00am" your output was incorrect.
-2. When the input was "2:03pm-1:39pm" your output was incorrect.
-3. When the input was "1:23am-1:08am" your output was incorrect.
-4. When the input was "2:08pm-2:00am" your output was incorrect.
-5. When the input was "2:00pm-3:00pm" your output was incorrect.
-6. When the input was "11:00am-2:10pm" your output was incorrect.
-7. When the input was "12:31pm-12:34pm" your output was incorrect.
-8. When the input was "3:00pm-4:45am" your output was incorrect.
-9. When the input was "5:00pm-5:11pm" your output was incorrect.