diff --git a/lib/compiler/passes/generate-bytecode.js b/lib/compiler/passes/generate-bytecode.js
index 113882e..bef6284 100644
--- a/lib/compiler/passes/generate-bytecode.js
+++ b/lib/compiler/passes/generate-bytecode.js
@@ -222,7 +222,7 @@ function generateBytecode(ast) {
   }
 
   function buildCall(functionIndex, delta, env, sp) {
-    var params = arrays.map(objects.values(env), function(p) { return sp - p; });
+    var params = objects.values(env).map(function(p) { return sp - p; });
 
     return [op.CALL, functionIndex, delta, params.length].concat(params);
   }
@@ -574,7 +574,7 @@ function generateBytecode(ast) {
       if (node.parts.length > 0) {
         regexp = '/^['
           + (node.inverted ? '^' : '')
-          + arrays.map(node.parts, function(part) {
+          + node.parts.map(function(part) {
               return part instanceof Array
                 ? js.regexpClassEscape(part[0])
                   + '-'
@@ -591,7 +591,7 @@ function generateBytecode(ast) {
       }
 
       parts = '['
-        + arrays.map(node.parts, function(part) {
+        + node.parts.map(function(part) {
             return part instanceof Array
               ? '["' + js.stringEscape(part[0]) + '", "' + js.stringEscape(part[1]) + '"]'
               : '"' + js.stringEscape(part) + '"';
diff --git a/lib/compiler/passes/generate-js.js b/lib/compiler/passes/generate-js.js
index 3bbc114..feb6994 100644
--- a/lib/compiler/passes/generate-js.js
+++ b/lib/compiler/passes/generate-js.js
@@ -21,10 +21,9 @@ function generateJS(ast, options) {
         '],',
         '',
         'peg$bytecode = [',
-           indent2(arrays.map(ast.rules, function(rule) {
+           indent2(ast.rules.map(function(rule) {
              return 'peg$decode("'
-                   + js.stringEscape(arrays.map(
-                       rule.bytecode,
+                   + js.stringEscape(rule.bytecode.map(
                        function(b) { return String.fromCharCode(b + 32); }
                      ).join(''))
                    + '")';
@@ -32,8 +31,7 @@ function generateJS(ast, options) {
         '],'
       ].join('\n');
     } else {
-      return arrays.map(
-        ast.consts,
+      return ast.consts.map(
         function(c, i) { return 'peg$c' + i + ' = ' + c + ','; }
       ).join('\n');
     }
@@ -443,7 +441,7 @@ function generateJS(ast, options) {
             if (n === void 0) {
               return s(this.sp--);
             } else {
-              values = arrays.map(arrays.range(this.sp - n + 1, this.sp + 1), s);
+              values = arrays.range(this.sp - n + 1, this.sp + 1).map(s);
               this.sp -= n;
 
               return values;
@@ -524,8 +522,7 @@ function generateJS(ast, options) {
             paramsLength = bc[ip + baseLength - 1];
 
         var value = c(bc[ip + 1]) + '('
-              + arrays.map(
-                  bc.slice(ip + baseLength, ip + baseLength + paramsLength),
+              + bc.slice(ip + baseLength, ip + baseLength + paramsLength).map(
                   function(p) { return stack.index(p); }
                 ).join(', ')
               + ')';
@@ -731,12 +728,12 @@ function generateJS(ast, options) {
 
     if (options.trace) {
       parts.push([
-        '  var ' + arrays.map(arrays.range(0, stack.maxSp + 1), s).join(', ') + ',',
+        '  var ' + arrays.range(0, stack.maxSp + 1).map(s).join(', ') + ',',
         '      startPos = peg$currPos;'
       ].join('\n'));
     } else {
       parts.push(
-        '  var ' + arrays.map(arrays.range(0, stack.maxSp + 1), s).join(', ') + ';'
+        '  var ' + arrays.range(0, stack.maxSp + 1).map(s).join(', ') + ';'
       );
     }
 
@@ -959,8 +956,7 @@ function generateJS(ast, options) {
 
     if (options.optimize === "size") {
       startRuleIndices = '{ '
-                       + arrays.map(
-                           options.allowedStartRules,
+                       + options.allowedStartRules.map(
                            function(r) { return r + ': ' + asts.indexOfRule(ast, r); }
                          ).join(', ')
                        + ' }';
@@ -972,8 +968,7 @@ function generateJS(ast, options) {
       ].join('\n'));
     } else {
       startRuleFunctions = '{ '
-                       + arrays.map(
-                           options.allowedStartRules,
+                       + options.allowedStartRules.map(
                            function(r) { return r + ': peg$parse' + r; }
                          ).join(', ')
                        + ' }';
@@ -1010,8 +1005,7 @@ function generateJS(ast, options) {
     if (options.trace) {
       if (options.optimize === "size") {
         ruleNames = '['
-                  + arrays.map(
-                      ast.rules,
+                  + ast.rules.map(
                       function(r) { return '"' + js.stringEscape(r.name) + '"'; }
                     ).join(', ')
                   + ']';
@@ -1267,8 +1261,7 @@ function generateJS(ast, options) {
       commonjs: function() {
         var parts          = [],
             dependencyVars = objects.keys(options.dependencies),
-            requires       = arrays.map(
-              dependencyVars,
+            requires       = dependencyVars.map(
               function(variable) {
                 return variable
                   + ' = require("'
@@ -1303,8 +1296,7 @@ function generateJS(ast, options) {
         var dependencyIds  = objects.values(options.dependencies),
             dependencyVars = objects.keys(options.dependencies),
             dependencies   = '['
-              + arrays.map(
-                  dependencyIds,
+              + dependencyIds.map(
                   function(id) { return '"' + js.stringEscape(id) + '"'; }
                 ).join(', ')
               + ']',
@@ -1342,13 +1334,11 @@ function generateJS(ast, options) {
             dependencyIds  = objects.values(options.dependencies),
             dependencyVars = objects.keys(options.dependencies),
             dependencies   = '['
-              + arrays.map(
-                  dependencyIds,
+              + dependencyIds.map(
                   function(id) { return '"' + js.stringEscape(id) + '"'; }
                 ).join(', ')
               + ']',
-            requires       = arrays.map(
-              dependencyIds,
+            requires       = dependencyIds.map(
               function(id) { return 'require("' + js.stringEscape(id) + '")'; }
             ).join(', '),
             params         = dependencyVars.join(', ');
diff --git a/lib/utils/arrays.js b/lib/utils/arrays.js
index 650f311..3b687aa 100644
--- a/lib/utils/arrays.js
+++ b/lib/utils/arrays.js
@@ -56,20 +56,8 @@ var arrays = {
     return arrays.indexOf(array, valueOrPredicate) !== -1;
   },
 
-  map: function(array, iterator) {
-    var length = array.length,
-        result = new Array(length),
-        i;
-
-    for (i = 0; i < length; i++) {
-      result[i] = iterator(array[i], i);
-    }
-
-    return result;
-  },
-
   pluck: function(array, key) {
-    return arrays.map(array, function (e) { return e[key]; });
+    return array.map(function (e) { return e[key]; });
   },
 
   every: function(array, predicate) {