refactor(limitTo): no need for all those checks if we use slice

Closes angular#10537

Author: petebacondarwin

src/ng/filter/limitTo.js

@@ -81,36 +81,11 @@ function limitToFilter(){
       limit = int(limit);
     }
 
-    if (isString(input)) {
-      //NaN check on limit
-      if (limit) {
-        return limit >= 0 ? input.slice(0, limit) : input.slice(limit, input.length);
-      } else {
-        return "";
-      }
-    }
-
-    var out = [],
-      i, n;
-
-    // if abs(limit) exceeds maximum length, trim it
-    if (limit > input.length)
-      limit = input.length;
-    else if (limit < -input.length)
-      limit = -input.length;
-
-    if (limit > 0) {
-      i = 0;
-      n = limit;
+    //NaN check on limit
+    if (limit) {
+      return limit > 0 ? input.slice(0, limit) : input.slice(limit);
     } else {
-      i = input.length + limit;
-      n = input.length;
+      return isString(input) ? "" : [];
     }
-
-    for (; i<n; i++) {
-      out.push(input[i]);
-    }
-
-    return out;
   };
 }