Use charAt instead of indexOf

Author: mjackson

modules/isActive.js

@@ -17,7 +17,7 @@ function pathnameIsActive(pathname, activePathname, activeRoutes, activeParams)
 
     pattern = route.path || ''
 
-    if (pattern.indexOf('/') !== 0)
+    if (pattern.charAt(0) !== '/')
       pattern = basename.replace(/\/*$/, '/') + pattern // Relative paths build on the parent's path.
 
     let { remainingPathname, paramNames, paramValues } = matchPattern(pattern, pathname)

modules/matchRoutes.js

@@ -49,7 +49,7 @@ function createParams(paramNames, paramValues) {
 function matchRouteDeep(basename, route, location, callback) {
   let pattern = route.path || ''
 
-  if (pattern.indexOf('/') !== 0)
+  if (pattern.charAt(0) !== '/')
     pattern = basename.replace(/\/*$/, '/') + pattern // Relative paths build on the parent's path.
 
   const { remainingPathname, paramNames, paramValues } = matchPattern(pattern, location.pathname)