Clean up JavaScript files to better follow coding standard.

src/string.js

Index: src/string.js
diff --git a/src/string.js b/src/string.js
index 4ac6089f3b0c3bfebcaf5209c40aaf8f48c5805d..91858293b350b2ed0c9ed0bba7fb499f70d5a4c1 100644
--- a/src/string.js
+++ b/src/string.js
@@ -46,16 +46,18 @@
 
 // ECMA-262 section 15.5.4.2
 function StringToString() {
-  if (!IS_STRING(this) && !IS_STRING_WRAPPER(this))
+  if (!IS_STRING(this) && !IS_STRING_WRAPPER(this)) {
     throw new $TypeError('String.prototype.toString is not generic');
+  }
   return %_ValueOf(this);
 }
 
 
 // ECMA-262 section 15.5.4.3
 function StringValueOf() {
-  if (!IS_STRING(this) && !IS_STRING_WRAPPER(this))
+  if (!IS_STRING(this) && !IS_STRING_WRAPPER(this)) {
     throw new $TypeError('String.prototype.valueOf is not generic');
+  }
   return %_ValueOf(this);
 }
 
@@ -531,30 +533,36 @@ function StringSlice(start, end) {
   var s_len = s.length;
   var start_i = TO_INTEGER(start);
   var end_i = s_len;
-  if (end !== void 0)
+  if (end !== void 0) {
     end_i = TO_INTEGER(end);
+  }
 
   if (start_i < 0) {
     start_i += s_len;
-    if (start_i < 0)
+    if (start_i < 0) {
       start_i = 0;
+    }
   } else {
-    if (start_i > s_len)
+    if (start_i > s_len) {
       start_i = s_len;
+    }
   }
 
   if (end_i < 0) {
     end_i += s_len;
-    if (end_i < 0)
+    if (end_i < 0) {
       end_i = 0;
+    }
   } else {
-    if (end_i > s_len)
+    if (end_i > s_len) {
       end_i = s_len;
+    }
   }
 
   var num_c = end_i - start_i;
-  if (num_c < 0)
+  if (num_c < 0) {
     num_c = 0;
+  }
 
   return SubString(s, start_i, start_i + num_c);
 }
@@ -692,7 +700,7 @@ function StringSubstring(start, end) {
     }
   }
 
-  return (start_i + 1 == end_i
+  return ((start_i + 1 == end_i)
           ? %_StringCharAt(s, start_i)
           : %_SubString(s, start_i, end_i));
 }
@@ -736,7 +744,7 @@ function StringSubstr(start, n) {
   var end = start + len;
   if (end > s.length) end = s.length;
 
-  return (start + 1 == end
+  return ((start + 1 == end)
           ? %_StringCharAt(s, start)
           : %_SubString(s, start, end));
 }