diff --git a/src/js/parser/javascript/charset_escape.js b/src/js/parser/javascript/charset_escape.js
index 331f678..f5bec9b 100644
--- a/src/js/parser/javascript/charset_escape.js
+++ b/src/js/parser/javascript/charset_escape.js
@@ -4,7 +4,5 @@ import Escape from './escape.js';
 export default _.extend({}, Escape, {
   type: 'charset_escape',
 
-  codeMap: _.extend({}, Escape.codeMap, {
-    b: 'backspace'
-  })
+  b: 'backspace'
 });
diff --git a/src/js/parser/javascript/escape.js b/src/js/parser/javascript/escape.js
index 97e2314..0b82d8e 100644
--- a/src/js/parser/javascript/escape.js
+++ b/src/js/parser/javascript/escape.js
@@ -4,61 +4,64 @@ import Base from './base.js';
 export default _.extend({}, Base, {
   type: 'escape',
 
-  codeMap: {
-    b: 'word boundary',
-    B: 'non-word boundary',
-    d: 'digit',
-    D: 'non-digit',
-    f: 'form feed',
-    n: 'line feed',
-    r: 'carriage return',
-    s: 'white space',
-    S: 'non-white space',
-    t: 'tab',
-    v: 'vertical tab',
-    w: 'word',
-    W: 'non-word',
-    1: 'Back reference (group = 1)',
-    2: 'Back reference (group = 2)',
-    3: 'Back reference (group = 3)',
-    4: 'Back reference (group = 4)',
-    5: 'Back reference (group = 5)',
-    6: 'Back reference (group = 6)',
-    7: 'Back reference (group = 7)',
-    8: 'Back reference (group = 8)',
-    9: 'Back reference (group = 9)',
-    0: (arg) => {
-      if (arg) {
-        return 'octal: ' + arg;
-      } else {
-        return 'null';
-      }
-    },
-    c: (arg) => {
-      return 'ctrl-' + arg;
-    },
-    x: (arg) => {
-      return '0x' + arg.toUpperCase();
-    },
-    u: (arg) => {
-      return 'U+' + arg.toUpperCase();
-    }
+  code() {
+    return this.esc.code.textValue;
+  },
+
+  arg() {
+    return this.esc.arg.textValue;
   },
 
   render() {
-    var code = this.codeMap[this.esc.code.textValue];
-
-    if (_.isFunction(code)) {
-      code = code(this.esc.arg.textValue);
-    }
-
     this.container.addClass('escape');
 
-    this.label = this.render_label(this.container, code);
+    this.label = this.render_label(this.container, _.result(this, this.code()));
 
     this.label.select('rect').attr({
       rx: 3,
       ry: 3
     });
+  },
+
+  // Escape code mappings
+  b: 'word boundary',
+  B: 'non-word boundary',
+  d: 'digit',
+  D: 'non-digit',
+  f: 'form feed',
+  n: 'line feed',
+  r: 'carriage return',
+  s: 'white space',
+  S: 'non-white space',
+  t: 'tab',
+  v: 'vertical tab',
+  w: 'word',
+  W: 'non-word',
+  1: 'Back reference (group = 1)',
+  2: 'Back reference (group = 2)',
+  3: 'Back reference (group = 3)',
+  4: 'Back reference (group = 4)',
+  5: 'Back reference (group = 5)',
+  6: 'Back reference (group = 6)',
+  7: 'Back reference (group = 7)',
+  8: 'Back reference (group = 8)',
+  9: 'Back reference (group = 9)',
+  0() {
+    var arg = this.arg();
+
+    if (arg) {
+      return 'octal: ' + arg;
+    } else {
+      return 'null';
+    }
+  },
+  c() {
+    return 'ctrl-' + this.arg();
+  },
+  x() {
+    return '0x' + this.arg().toUpperCase();
+  },
+  u() {
+    return 'U+' + this.arg().toUpperCase();
   }
 });