update

dist/naive-bayes.js

@@ -297,11 +297,12 @@ var NaiveBayes = function () {
       var classifier = new NaiveBayes(json.options);
 
       // override the classifier's state
-      STATE_KEYS.forEach(function (k) {
-        if (!json[k]) {
-          throw new Error('NaiveBayes.fromJson: JSON string is missing an expected property: \'' + k + '\'.');
+      STATE_KEYS.forEach(function (key) {
+        if (json[key] == undefined) {
+          throw new Error('NaiveBayes.fromJson: JSON string is missing an expected property: \'' + key + '\'.');
+        } else {
+          classifier[key] = json[key];
         }
-        classifier[k] = json[k];
       });
 
       return classifier;

lib/naive-bayes.js

@@ -266,11 +266,12 @@ class NaiveBayes {
     const classifier = new NaiveBayes(json.options)
 
     // override the classifier's state
-    STATE_KEYS.forEach(k => {
-      if (!json[k]) {
-        throw new Error(`NaiveBayes.fromJson: JSON string is missing an expected property: '${k}'.`)
+    STATE_KEYS.forEach(key => {
+      if (json[key] == undefined) {
+        throw new Error(`NaiveBayes.fromJson: JSON string is missing an expected property: '${key}'.`)
+      } else {
+        classifier[key] = json[key]
       }
-      classifier[k] = json[k]
     })
 
     return classifier

package.json

@@ -1,12 +1,13 @@
 {
   "name": "naivebayes",
-  "version": "0.2.0",
+  "version": "0.3.0",
   "description": "Naive Bayes Classifier for node.js.",
   "main": "dist/naive-bayes.js",
   "scripts": {
     "dev": "nodemon --exec \"NODE_ENV=development node --harmony test.js\"",
     "build": "babel lib --out-dir dist",
-    "test": "node test.js"
+    "test": "node test.js",
+    "deploy": "git push && npm publish && git push --tags"
   },
   "author": "Surmon",
   "license": "MIT",