diff --git a/lib/utils/README.md b/lib/utils/README.md
index 8e62cda1..c1741b3a 100644
--- a/lib/utils/README.md
+++ b/lib/utils/README.md
@@ -13,5 +13,5 @@ var myModule = ...;
 
 var helpers = utils(myModule);
 
-var str = helpers.getString(myModule.exportReturningAString());
+var str = helpers.string(myModule.exportReturningAString());
 ```
diff --git a/lib/utils/index.js b/lib/utils/index.js
index d29de790..d5aaec69 100644
--- a/lib/utils/index.js
+++ b/lib/utils/index.js
@@ -1,21 +1,103 @@
-module.exports = function(module) {
-  return {
-    getI32: function(ptr) {
-      return new Int32Array(module.memory.buffer, ptr, 4)[0];
-    },
-    getU32: function(ptr) {
-      return new Uint32Array(module.memory.buffer, ptr, 4)[0];
-    },
-    getF32: function(ptr) {
-      return new Float32Array(module.memory.buffer, ptr, 4)[0];
-    },
-    getF64: function(ptr) {
-      return new Float64Array(module.memory.buffer, ptr, 8)[0];
-    },
-    getString: function(ptr) {
-      var len = new Uint32Array(module.memory.buffer, ptr, 4)[0];
-      var str = new Uint16Array(module.memory.buffer, ptr + 4, len << 1);
-      return String.fromCharCode.apply(String, str);
-    }
+function utils(module) {
+
+  var i8,
+      u8 = new Uint8Array(0),
+      i16,
+      u16,
+      i32,
+      u32,
+      f32,
+      f64;
+
+  function maybeUpdate() {
+    var mem = module.memory.buffer;
+    if (mem.byteLength === u8.length)
+      return;
+    i8 = Int8Array(mem);
+    u8 = Uint8Array(mem);
+    i16 = Int16Array(mem);
+    u16 = Uint16Array(mem);
+    i32 = Int32Array(mem);
+    u32 = Uint32Array(mem);
+    f32 = Float32Array(mem);
+    f64 = Float64Array(mem);
   }
+
+  var helpers = {
+
+    i8: function(ptr) {
+      maybeUpdate();
+      return i8[ptr];
+    },
+
+    u8: function(ptr) {
+      maybeUpdate();
+      return u8[ptr];
+    },
+
+    i16: function(ptr) {
+      maybeUpdate();
+      return i16[ptr >>> 1];
+    },
+
+    u16: function(ptr) {
+      maybeUpdate();
+      return u16[ptr >>> 1];
+    },
+
+    i32: function(ptr) {
+      maybeUpdate();
+      return i32[ptr >>> 2];
+    },
+
+    u32: function(ptr) {
+      maybeUpdate();
+      return u32[ptr >>> 2];
+    },
+
+    i64: function(ptr) {
+      maybeUpdate();
+      return {
+        low: i32[ptr >>> 2],
+        high: i32[(ptr >>> 2) + 1]
+      };
+    },
+
+    u64: function(ptr) {
+      maybeUpdate();
+      return {
+        low: u32[ptr >>> 2],
+        high: u32[(ptr >>> 2) + 1]
+      };
+    },
+
+    bool: function(ptr) {
+      maybeUpdate();
+      return u8[ptr] === 1;
+    },
+
+    f32: function(ptr) {
+      maybeUpdate();
+      return f32[ptr >>> 2];
+    },
+
+    f64: function(ptr) {
+      maybeUpdate();
+      return f64[ptr >>> 3];
+    },
+
+    string: function(ptr) {
+      maybeUpdate();
+      var len = u32[ptr >>> 2];
+      var off = (ptr >>> 1) + 2;
+      return String.fromCharCode.apply(String, u16.subarray(off, off + len));
+    }
+  };
+
+  return helpers;
 };
+
+Object.defineProperties(module.exports = utils, {
+  __esModule: { value: true },
+  default: { value: utils }
+});
diff --git a/lib/webpack/README.md b/lib/webpack/README.md
index 8c411d9b..fb2b2737 100644
--- a/lib/webpack/README.md
+++ b/lib/webpack/README.md
@@ -11,3 +11,5 @@ import Module from "@assemblyscript/webpack!module.wasm";
 
 var myModule = Module({ imports: { ... }});
 ```
+
+TODO: Wire .ts files to the compiler API, accepting options, but also keep raw .wasm support.
diff --git a/lib/webpack/decode.js b/lib/webpack/decode.js
index b167b9c8..6352c0dd 100644
--- a/lib/webpack/decode.js
+++ b/lib/webpack/decode.js
@@ -7,23 +7,23 @@ module.exports = function(string) {
   // determine buffer length
   var length = string.length;
   if (length) {
-    var n = 0;
-    while (--length % 4 > 1 && string.charCodeAt(p) === 61) ++n;
-    length = Math.ceil(string.length * 3) / 4 - n;
+    var n = 0, p = length;
+    while (--p % 4 > 1 && string.charCodeAt(p) === 61) ++n;
+    length = Math.ceil(length * 3) / 4 - n;
   }
 
   // decode to buffer
   var buffer = new Uint8Array(length);
-  var j = 0, t;
+  var j = 0, o = 0, t;
   for (var i = 0, k = string.length; i < k;) {
     var c = string.charCodeAt(i++);
     if (c === 61 && j > 1) break;
     if ((c = s64[c]) === undefined) throw Error();
     switch (j) {
       case 0: t = c; j = 1; break;
-      case 1: buffer[offset++] = t << 2 | (c & 48) >> 4; t = c; j = 2; break;
-      case 2: buffer[offset++] = (t & 15) << 4 | (c & 60) >> 2; t = c; j = 3; break;
-      case 3: buffer[offset++] = (t & 3) << 6 | c; j = 0; break;
+      case 1: buffer[o++] = t << 2 | (c & 48) >> 4; t = c; j = 2; break;
+      case 2: buffer[o++] = (t & 15) << 4 | (c & 60) >> 2; t = c; j = 3; break;
+      case 3: buffer[o++] = (t & 3) << 6 | c; j = 0; break;
     }
   }
   if (j === 1) throw Error();
diff --git a/lib/webpack/index.js b/lib/webpack/index.js
index 4b30af44..f17898ba 100644
--- a/lib/webpack/index.js
+++ b/lib/webpack/index.js
@@ -1,6 +1,6 @@
 var base64 = require("@protobufjs/base64");
 
-(module.exports = function(buffer) {
+function loader(buffer) {
   var data = base64.encode(buffer, 0, buffer.length);
   var code = [
     'var data = "' + data + '", wasm;',
@@ -9,5 +9,12 @@ var base64 = require("@protobufjs/base64");
     '  return new WebAssembly.Instance(new WebAssembly.Module(wasm), options && options.imports || {}).exports;',
     '};'
   ];
-  return code.join("\n");
-}).raw = true;
+  return code.join("\n") + "\n";
+}
+
+loader.raw = true;
+
+Object.defineProperties(module.exports = loader, {
+  __esModule: { value: true },
+  default: { value: loader }
+});
diff --git a/src/parser.ts b/src/parser.ts
index c99f9fa1..83d90609 100644
--- a/src/parser.ts
+++ b/src/parser.ts
@@ -36,6 +36,7 @@ import {
   Expression,
   AssertionKind,
   CallExpression,
+  ElementAccessExpression,
   IdentifierExpression,
   StringLiteralExpression,
 
@@ -1467,7 +1468,7 @@ export class Parser extends DiagnosticEmitter {
         var elementExpressions = new Array<Expression | null>();
         if (!tn.skip(Token.CLOSEBRACKET)) {
           do {
-            if (tn.peek() == Token.COMMA || tn.peek() == Token.CLOSEBRACKET)
+            if (tn.peek() == Token.COMMA)
               expr = null; // omitted
             else {
               expr = this.parseExpression(tn, Precedence.COMMA + 1);
@@ -1475,6 +1476,8 @@ export class Parser extends DiagnosticEmitter {
                 return null;
             }
             elementExpressions.push(expr);
+            if (tn.peek() == Token.CLOSEBRACKET)
+              break;
           } while (tn.skip(Token.COMMA));
           if (!tn.skip(Token.CLOSEBRACKET)) {
             this.error(DiagnosticCode._0_expected, tn.range(), "]");
@@ -1588,19 +1591,6 @@ export class Parser extends DiagnosticEmitter {
 
     var startPos = expr.range.start;
 
-    // ElementAccessExpression
-    if (tn.skip(Token.OPENBRACKET)) {
-      next = this.parseExpression(tn); // resets precedence
-      if (!next)
-        return null;
-      if (tn.skip(Token.CLOSEBRACKET))
-        expr = Node.createElementAccessExpression(<Expression>expr, <Expression>next, tn.range(startPos, tn.pos));
-      else {
-        this.error(DiagnosticCode._0_expected, tn.range(), "]");
-        return null;
-      }
-    }
-
     // CallExpression
     var typeArguments = this.tryParseTypeArgumentsBeforeArguments(tn); // skips '(' on success
     // there might be better ways to distinguish a LESSTHAN from a CALL with type arguments
@@ -1617,70 +1607,93 @@ export class Parser extends DiagnosticEmitter {
     while ((nextPrecedence = determinePrecedence(token = tn.peek())) >= precedence) { // precedence climbing
       tn.next();
 
-      // AssertionExpression
-      if (token == Token.AS) {
-        var toType = this.parseType(tn);
-        if (!toType)
-          return null;
-        expr = Node.createAssertionExpression(AssertionKind.AS, expr, toType, tn.range(startPos, tn.pos));
+      switch (token) {
 
-      // UnaryPostfixExpression
-      } else if (token == Token.PLUS_PLUS || token == Token.MINUS_MINUS) {
-        if (expr.kind != NodeKind.IDENTIFIER && expr.kind != NodeKind.ELEMENTACCESS && expr.kind != NodeKind.PROPERTYACCESS)
-          this.error(DiagnosticCode.The_operand_of_an_increment_or_decrement_operator_must_be_a_variable_or_a_property_access, expr.range);
-        expr = Node.createUnaryPostfixExpression(token, expr, tn.range(startPos, tn.pos));
-
-      // TernaryExpression
-      } else if (token == Token.QUESTION) {
-        var ifThen = this.parseExpression(tn);
-        if (!ifThen)
-          return null;
-        if (tn.skip(Token.COLON)) {
-          var ifElse = this.parseExpression(tn);
-          if (!ifElse)
+        // AssertionExpression
+        case Token.AS:
+          var toType = this.parseType(tn);
+          if (!toType)
             return null;
-          expr = Node.createTernaryExpression(<Expression>expr, <Expression>ifThen, <Expression>ifElse, tn.range(startPos, tn.pos));
-        } else {
-          this.error(DiagnosticCode._0_expected, tn.range(), ":");
-          return null;
-        }
+          expr = Node.createAssertionExpression(AssertionKind.AS, expr, toType, tn.range(startPos, tn.pos));
+          break;
 
-      // CommaExpression
-      } else if (token == Token.COMMA) {
-        var commaExprs = new Array<Expression>(1);
-        commaExprs[0] = <Expression>expr;
-        do {
-          expr = this.parseExpression(tn, Precedence.COMMA + 1);
-          if (!expr)
+        // ElementAccessExpression
+        case Token.OPENBRACKET:
+          next = this.parseExpression(tn);
+          if (!next)
             return null;
-          commaExprs.push(expr);
-        } while (tn.skip(Token.COMMA));
-        expr = Node.createCommaExpression(commaExprs, tn.range(startPos, tn.pos));
-
-      } else {
-        next = this.parseExpression(tn, isRightAssociative(token) ? nextPrecedence : 1 + nextPrecedence);
-        if (!next)
-          return null;
-
-        // PropertyAccessExpression
-        if (token == Token.DOT) {
-          if (next.kind == NodeKind.IDENTIFIER) {
-            expr = Node.createPropertyAccessExpression(<Expression>expr, <IdentifierExpression>next, tn.range(startPos, tn.pos));
-          } else if (next.kind == NodeKind.CALL) { // amend
-            var propertyCall = <CallExpression>next;
-            if (propertyCall.expression.kind == NodeKind.IDENTIFIER) {
-              propertyCall.expression = Node.createPropertyAccessExpression(<Expression>expr, <IdentifierExpression>propertyCall.expression, tn.range(startPos, tn.pos));
-            } else
-              throw new Error("unexpected expression kind");
-            expr = propertyCall;
-          } else {
-            this.error(DiagnosticCode.Identifier_expected, next.range);
+          if (!tn.skip(Token.CLOSEBRACKET)) {
+            this.error(DiagnosticCode._0_expected, tn.range(), "]");
             return null;
           }
+          expr = Node.createElementAccessExpression(<Expression>expr, <Expression>next, tn.range(startPos, tn.pos));
+          break;
 
-        // BinaryExpression
-        } else
-          expr = Node.createBinaryExpression(token, <Expression>expr, <Expression>next, tn.range(startPos, tn.pos));
+        // UnaryPostfixExpression
+        case Token.PLUS_PLUS:
+        case Token.MINUS_MINUS:
+          if (expr.kind != NodeKind.IDENTIFIER && expr.kind != NodeKind.ELEMENTACCESS && expr.kind != NodeKind.PROPERTYACCESS)
+            this.error(DiagnosticCode.The_operand_of_an_increment_or_decrement_operator_must_be_a_variable_or_a_property_access, expr.range);
+          expr = Node.createUnaryPostfixExpression(token, expr, tn.range(startPos, tn.pos));
+          break;
+
+        // TernaryExpression
+        case Token.QUESTION:
+          var ifThen = this.parseExpression(tn);
+          if (!ifThen)
+            return null;
+          if (tn.skip(Token.COLON)) {
+            var ifElse = this.parseExpression(tn);
+            if (!ifElse)
+              return null;
+            expr = Node.createTernaryExpression(<Expression>expr, <Expression>ifThen, <Expression>ifElse, tn.range(startPos, tn.pos));
+          } else {
+            this.error(DiagnosticCode._0_expected, tn.range(), ":");
+            return null;
+          }
+          break;
+
+        // CommaExpression
+        case Token.COMMA:
+          var commaExprs = new Array<Expression>(1);
+          commaExprs[0] = <Expression>expr;
+          do {
+            expr = this.parseExpression(tn, Precedence.COMMA + 1);
+            if (!expr)
+              return null;
+            commaExprs.push(expr);
+          } while (tn.skip(Token.COMMA));
+          expr = Node.createCommaExpression(commaExprs, tn.range(startPos, tn.pos));
+          break;
+
+        default:
+          next = this.parseExpression(tn, isRightAssociative(token) ? nextPrecedence : 1 + nextPrecedence);
+          if (!next)
+            return null;
+
+          // PropertyAccessExpression
+          if (token == Token.DOT) {
+            if (next.kind == NodeKind.IDENTIFIER)
+              expr = Node.createPropertyAccessExpression(<Expression>expr, <IdentifierExpression>next, tn.range(startPos, tn.pos));
+            else if (next.kind == NodeKind.CALL) { // join
+              var propertyCall = <CallExpression>next;
+              if (propertyCall.expression.kind == NodeKind.IDENTIFIER) {
+                propertyCall.expression = Node.createPropertyAccessExpression(<Expression>expr, <IdentifierExpression>propertyCall.expression, tn.range(startPos, tn.pos));
+              } else {
+                this.error(DiagnosticCode.Identifier_expected, propertyCall.expression.range);
+                return null;
+              }
+              expr = propertyCall;
+            } else {
+              this.error(DiagnosticCode.Identifier_expected, next.range);
+              return null;
+            }
+
+          // BinaryExpression
+          } else
+            expr = Node.createBinaryExpression(token, <Expression>expr, <Expression>next, tn.range(startPos, tn.pos));
+
+          break;
       }
     }
     return expr;
@@ -1820,6 +1833,7 @@ function determinePrecedence(kind: Token): i32 {
 
     case Token.DOT:
     case Token.NEW:
+    case Token.OPENBRACKET:
       return Precedence.MEMBERACCESS;
 
     default:
diff --git a/src/program.ts b/src/program.ts
index b58e643e..d87502a1 100644
--- a/src/program.ts
+++ b/src/program.ts
@@ -33,10 +33,12 @@ import {
   DecoratorKind,
 
   Expression,
+  AssertionExpression,
   ElementAccessExpression,
   IdentifierExpression,
   LiteralExpression,
   LiteralKind,
+  ParenthesizedExpression,
   PropertyAccessExpression,
   StringLiteralExpression,
   SuperExpression,
@@ -66,7 +68,8 @@ import {
   hasDecorator,
   hasModifier,
   mangleInternalName,
-  getFirstDecorator
+  getFirstDecorator,
+  BinaryExpression
 } from "./ast";
 
 import {
@@ -1156,8 +1159,22 @@ export class Program extends DiagnosticEmitter {
 
   resolveExpression(expression: Expression, contextualFunction: Function): ResolvedElement | null {
     var classType: Class | null;
+
+    while (expression.kind == NodeKind.PARENTHESIZED)
+      expression = (<ParenthesizedExpression>expression).expression;
+
     switch (expression.kind) {
 
+      case NodeKind.ASSERTION:
+        var type = this.resolveType((<AssertionExpression>expression).toType); // reports
+        if (type && (classType = type.classType))
+          return (resolvedElement || (resolvedElement = new ResolvedElement())).set(classType);
+        return null;
+
+      case NodeKind.BINARY:
+        // TODO: string concatenation, mostly
+        throw new Error("not implemented");
+
       case NodeKind.THIS: // -> Class
         if (classType = contextualFunction.instanceMethodOf)
           return (resolvedElement || (resolvedElement = new ResolvedElement())).set(classType);
diff --git a/std/assembly/iterator.ts b/std/assembly/iterator.ts
new file mode 100644
index 00000000..fd98ead4
--- /dev/null
+++ b/std/assembly/iterator.ts
@@ -0,0 +1,4 @@
+// export abstract class Iterator<T> {
+//   abstract get done(): bool;
+//   abstract next(): T;
+// }
diff --git a/std/assembly/map.ts b/std/assembly/map.ts
index 06983725..1506b00a 100644
--- a/std/assembly/map.ts
+++ b/std/assembly/map.ts
@@ -1,3 +1,37 @@
 export class Map<K,V> {
-  // TODO
+
+  private __keys: K[] = [];
+  private __values: V[] = [];
+
+  // FIXME: not a proper map implementation, just a filler
+
+  get size(): i32 {
+    return this.__keys.length;
+  }
+
+  get(key: K): V | null {
+    var keys = this.__keys;
+    for (var i = 0, k = keys.length; i < k; ++i)
+      if (keys[i] == key)
+        return this.__values[i];
+    return null;
+  }
+
+  has(key: K): bool {
+    var keys = this.__keys;
+    for (var i = 0, k = keys.length; i < k; ++i)
+      if (keys[i] == key)
+        return true;
+    return false;
+  }
+
+  set(key: K, value: V): void {
+    this.__keys.push(key);
+    this.__values.push(value);
+  }
+
+  clear(): void {
+    this.__keys.length = 0;
+    this.__values.length = 0;
+  }
 }
diff --git a/std/assembly/set.ts b/std/assembly/set.ts
index 35fc199e..464c0208 100644
--- a/std/assembly/set.ts
+++ b/std/assembly/set.ts
@@ -66,3 +66,14 @@ export class Set<T> {
 
   // TODO: think about iterators
 }
+
+// class SetIterator<T> extends Iterator<T> {
+
+//   get done(): bool {
+//     throw new Error("not implemented");
+//   }
+
+//   next(): T {
+//     throw new Error("not implemented");
+//   }
+// }
diff --git a/tests/compiler/std/array.wast b/tests/compiler/std/array.wast
index 26026953..4a5cec37 100644
--- a/tests/compiler/std/array.wast
+++ b/tests/compiler/std/array.wast
@@ -4052,6 +4052,7 @@
   CLASS_PROTOTYPE: std:error/RangeError
   CLASS_PROTOTYPE: RangeError
   CLASS_PROTOTYPE: std:map/Map
+  PROPERTY: std:map/Map#size
   CLASS_PROTOTYPE: Map
   FUNCTION_PROTOTYPE: std:memory/copy_memory
   FUNCTION_PROTOTYPE: std:memory/move_memory
diff --git a/tests/compiler/std/carray.wast b/tests/compiler/std/carray.wast
index 4fbcc01d..64f5559d 100644
--- a/tests/compiler/std/carray.wast
+++ b/tests/compiler/std/carray.wast
@@ -259,6 +259,7 @@
   CLASS_PROTOTYPE: std:error/RangeError
   CLASS_PROTOTYPE: RangeError
   CLASS_PROTOTYPE: std:map/Map
+  PROPERTY: std:map/Map#size
   CLASS_PROTOTYPE: Map
   FUNCTION_PROTOTYPE: std:memory/copy_memory
   FUNCTION_PROTOTYPE: std:memory/move_memory
diff --git a/tests/compiler/std/heap.wast b/tests/compiler/std/heap.wast
index db5572d6..36a0a1ab 100644
--- a/tests/compiler/std/heap.wast
+++ b/tests/compiler/std/heap.wast
@@ -2868,6 +2868,7 @@
   CLASS_PROTOTYPE: std:error/RangeError
   CLASS_PROTOTYPE: RangeError
   CLASS_PROTOTYPE: std:map/Map
+  PROPERTY: std:map/Map#size
   CLASS_PROTOTYPE: Map
   FUNCTION_PROTOTYPE: std:memory/copy_memory
   FUNCTION_PROTOTYPE: std:memory/move_memory
diff --git a/tests/compiler/std/new.wast b/tests/compiler/std/new.wast
index 534e4d74..67c76302 100644
--- a/tests/compiler/std/new.wast
+++ b/tests/compiler/std/new.wast
@@ -209,6 +209,7 @@
   CLASS_PROTOTYPE: std:error/RangeError
   CLASS_PROTOTYPE: RangeError
   CLASS_PROTOTYPE: std:map/Map
+  PROPERTY: std:map/Map#size
   CLASS_PROTOTYPE: Map
   FUNCTION_PROTOTYPE: std:memory/copy_memory
   FUNCTION_PROTOTYPE: std:memory/move_memory
diff --git a/tests/compiler/std/set.wast b/tests/compiler/std/set.wast
index b6ef7a8f..6d7a2b6c 100644
--- a/tests/compiler/std/set.wast
+++ b/tests/compiler/std/set.wast
@@ -2777,6 +2777,7 @@
   CLASS_PROTOTYPE: std:error/RangeError
   CLASS_PROTOTYPE: RangeError
   CLASS_PROTOTYPE: std:map/Map
+  PROPERTY: std:map/Map#size
   CLASS_PROTOTYPE: Map
   FUNCTION_PROTOTYPE: std:memory/copy_memory
   FUNCTION_PROTOTYPE: std:memory/move_memory
diff --git a/tests/compiler/std/string.wast b/tests/compiler/std/string.wast
index 4fca1051..abfc3add 100644
--- a/tests/compiler/std/string.wast
+++ b/tests/compiler/std/string.wast
@@ -1504,6 +1504,7 @@
   CLASS_PROTOTYPE: std:error/RangeError
   CLASS_PROTOTYPE: RangeError
   CLASS_PROTOTYPE: std:map/Map
+  PROPERTY: std:map/Map#size
   CLASS_PROTOTYPE: Map
   FUNCTION_PROTOTYPE: std:memory/copy_memory
   FUNCTION_PROTOTYPE: std:memory/move_memory
diff --git a/tests/parser/propertyelementaccess.ts b/tests/parser/propertyelementaccess.ts
new file mode 100644
index 00000000..d3972d02
--- /dev/null
+++ b/tests/parser/propertyelementaccess.ts
@@ -0,0 +1 @@
+(((this).values[0].prop1.prop2.another[1]).prop)[2];
diff --git a/tests/parser/propertyelementaccess.ts.fixture.ts b/tests/parser/propertyelementaccess.ts.fixture.ts
new file mode 100644
index 00000000..d3972d02
--- /dev/null
+++ b/tests/parser/propertyelementaccess.ts.fixture.ts
@@ -0,0 +1 @@
+(((this).values[0].prop1.prop2.another[1]).prop)[2];