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connected_times_in_list.gs

@@ -0,0 +1,40 @@
+function myFunction() {
+  var list_of_times = ["11:00-11:40", "11:20-12:00", "12:10-12:20", "12:30-12:50"];
+  //intitializing the start time
+  var first_item = list_of_times[0];
+  var start_string = first_item.slice(0,first_item.indexOf("-"));
+  //intializing new list and marker
+  var new_list = [];
+  var marker = 0;
+
+  for (var t = 0; t < (list_of_times.length-1); t++){
+    // need to check for last time in list because of the way these comparisons are setup
+    var current_string = list_of_times[t];
+
+    //leftside comparison setup
+    var current_end_string = current_string.slice(6,11);
+    var left_comp = current_string.slice(6,8) + current_string.slice(9,11);
+    var left_numb = Number(left_comp);
+
+    //rightside comparison setup
+    var next_string = list_of_times[t+1];
+    var right_comp = next_string.slice(0,2) + next_string.slice(3,5);
+    var right_numb = Number(right_comp);
+
+    if (right_numb > left_numb){
+      new_list.push(start_string + "-" + current_end_string);
+      start_string = next_string.slice(0,first_item.indexOf("-"));
+      if (t == (list_of_times.length-2)){
+        marker = 1}
+    }
+
+    if ((t==list_of_times.length-2) && (marker == 0)){
+      new_list.push(start_string + "-" + (next_string.slice(6,11)))
+    }
+
+  }
+  if (marker == 1){
+    new_list.push(list_of_times[(list_of_times.length-1)]);
+  }
+  Logger.log(new_list)
+}