diff --git a/jspath.min.js b/jspath.min.js
index 9dd9ae9..53bae9f 100644
--- a/jspath.min.js
+++ b/jspath.min.js
@@ -8,4 +8,4 @@
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diff --git a/lib/jspath.js b/lib/jspath.js
index abde97c..cdfb243 100644
--- a/lib/jspath.js
+++ b/lib/jspath.js
@@ -35,7 +35,7 @@ var SYNTAX = {
         BINARY_EXPR  : 6,
         CONCAT_EXPR  : 7,
         UNARY_EXPR   : 8,
-        ARRAY_EXPR   : 9,
+        POS_EXPR     : 9,
         LITERAL      : 10,
         SUBST        : 11
     };
@@ -268,7 +268,7 @@ var parse = (function() {
         if(match(':')) {
             lex();
             return {
-                type  : SYNTAX.ARRAY_EXPR,
+                type  : SYNTAX.POS_EXPR,
                 toIdx : parseUnaryExpr()
             };
         }
@@ -278,21 +278,21 @@ var parse = (function() {
             lex();
             if(match(']')) {
                 return {
-                    type    : SYNTAX.ARRAY_EXPR,
+                    type    : SYNTAX.POS_EXPR,
                     fromIdx : fromExpr
                 };
 
             }
 
             return {
-                type    : SYNTAX.ARRAY_EXPR,
+                type    : SYNTAX.POS_EXPR,
                 fromIdx : fromExpr,
                 toIdx   : parseUnaryExpr()
             };
         }
 
         return {
-            type : SYNTAX.ARRAY_EXPR,
+            type : SYNTAX.POS_EXPR,
             idx  : fromExpr
         };
     }
@@ -837,46 +837,31 @@ var translate = (function() {
             var idx = acquireVar();
             translateExpression(arrayExpr.idx, idx, ctx);
             body.push(
-                idx, '=', generateNormalizeArrayIndex(idx, ctx), ';',
+                idx, '< 0 && (', idx, '=', ctx, '.length +', idx, ');',
                 dest, '=', ctx, '[', idx, '] == null? [] : [', ctx, '[', idx, ']];');
             releaseVars(idx);
             return false;
         }
         else if(arrayExpr.fromIdx) {
             if(arrayExpr.toIdx) {
-                fromIdx = acquireVar();
-                toIdx = acquireVar();
-                translateExpression(arrayExpr.fromIdx, fromIdx, ctx);
-                translateExpression(arrayExpr.toIdx, toIdx, ctx);
-                body.push(
-                    fromIdx, '=', generateNormalizeArrayIndex(fromIdx, ctx), ';',
-                    toIdx, '=', generateNormalizeArrayIndex(toIdx, ctx), ';',
-                    dest, '=', ctx, '.slice(', fromIdx, ', ', toIdx, ');');
+                translateExpression(arrayExpr.fromIdx, fromIdx = acquireVar(), ctx);
+                translateExpression(arrayExpr.toIdx, toIdx = acquireVar(), ctx);
+                body.push(dest, '=', ctx, '.slice(', fromIdx, ', ', toIdx, ');');
                 releaseVars(fromIdx, toIdx);
             }
             else {
-                fromIdx = acquireVar();
-                translateExpression(arrayExpr.fromIdx, fromIdx, ctx);
-                body.push(
-                    fromIdx, '=', generateNormalizeArrayIndex(fromIdx, ctx), ';',
-                    dest, '=', ctx, '.slice(', fromIdx, ');');
+                translateExpression(arrayExpr.fromIdx, fromIdx = acquireVar(), ctx);
+                body.push(dest, '=', ctx, '.slice(', fromIdx, ');');
                 releaseVars(fromIdx);
             }
         }
         else {
-            toIdx = acquireVar();
-            translateExpression(arrayExpr.toIdx, toIdx, ctx);
-            body.push(
-                toIdx, '=', generateNormalizeArrayIndex(toIdx, ctx), ';',
-                dest, '=', ctx, '.slice(0, ', toIdx, ');');
+            translateExpression(arrayExpr.toIdx, toIdx = acquireVar(), ctx);
+            body.push(dest, '=', ctx, '.slice(0, ', toIdx, ');');
             releaseVars(toIdx);
         }
     }
 
-    function generateNormalizeArrayIndex(val, ctx) {
-        return [val, '< 0?', ctx, '.length +', val, ':', val].join('');
-    }
-
     function translateExpression(expr, dest, ctx) {
         switch(expr.type) {
             case SYNTAX.PATH: