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Testing effects of API implementation (use of more function calls) on performance

Preparation code

<script>
  var lib_1 = (function() {
  
   function check_list(list) {
    if (!list || list.length < 1) return false;
    return true;
   }
  
   function sum(list, type) {
    if (!check_list(list)) {
     if (type == "number") return 0;
     else return "";
    }
  
    var ret = list[0];
    for (var i = 1; i < list.length; i++) {
     if (typeof list[i] == type) {
      ret += list[i];
     }
    }
    return ret;
   }
  
   function sum_numbers(list) {
    return sum(list, "number");
   }
  
   function concat_strings(list) {
    return sum(list, "string");
   }
  
   return {
    SumNumbers: sum_numbers,
    ConcatStrings: concat_strings,
    Add: function(list) {
     if (!check_list(list)) {
      return;
     }
     else if (typeof list[0] == "number") {
      return sum_numbers(list);
     }
     else if (typeof list[0] == "string") {
      return concat_strings(list);
     }
    }
   }
  })();
  
  var lib_2 = (function() {
  
   function sum(list, type) {
    var ret = list[0];
    for (var i = 1; i < list.length; i++) {
     if (typeof list[i] == type) {
      ret += list[i];
     }
    }
    return ret;
   }
  
   return {
    SumNumbers: function(list) {
     if (!list || list.length < 1) return 0;
     return sum(list, "number");
    },
    ConcatStrings: function(list) {
     if (!list || list.length < 1) return "";
     return sum(list, "string");
    },
    Add: function(list) {
     if (!list || list.length < 1) return;
     return sum(list, (typeof list[0]));
    }
   }
  })();
  
  var list_of_nums = [5, 10, 3, 0, 12, 194.8 /* , ... */ ];
  var list_of_strings = ["a", "foo", "bar", "baz" /* , ... */ ];
</script>

Test runner

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lib_1.Add();
lib_1.Add(list_of_nums);
lib_1.Add(list_of_strings);

lib_2.Add();
lib_2.Add(list_of_nums);
lib_2.Add(list_of_strings);

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