Print functions correctly

Author: rafeca

lib/prettyjson.js

@@ -8,9 +8,13 @@ exports.version = require('../package.json').version;
 
 // Helper function to detect if an object can be directly serializable
 var isSerializable = function(input, onlyPrimitives, options) {
-  if (typeof input === 'boolean' ||
-      typeof input === 'number' || input === null ||
-             input instanceof Date) {
+  if (
+    typeof input === 'boolean' ||
+    typeof input === 'number' ||
+    typeof input === 'function' ||
+    input === null ||
+    input instanceof Date
+  ) {
     return true;
   }
   if (typeof input === 'string' && input.indexOf('\n') === -1) {
@@ -50,6 +54,10 @@ var addColorToData = function(input, options) {
   if (typeof input === 'number') {
     return colors[options.numberColor](sInput);
   }
+  if (typeof input === 'function') {
+    return 'function() {}';
+  }
+
   if (Array.isArray(input)) {
     return input.join(', ');
   }
@@ -70,7 +78,7 @@ var renderToArray = function(data, options, indentation) {
     return [Utils.indent(indentation) + addColorToData(data, options)];
   }
 
-  //unserializable string means it's multiline
+  // Unserializable string means it's multiline
   if (typeof data === 'string') {
     return [
       Utils.indent(indentation) + '"""',

test/prettyjson_spec.js

@@ -40,6 +40,16 @@ describe('prettyjson general tests', function() {
     ].join('\n'));
   });
 
+  it('should output a function', function() {
+    var input = ['first string', function(a) { return a;}];
+    var output = prettyjson.render(input);
+
+    output.should.equal([
+      colors.green('- ') + input[0],
+      colors.green('- ') + 'function() {}',
+    ].join('\n'));
+  });
+
   it('should output an array of arrays', function() {
     var input = ['first string', ['nested 1', 'nested 2'], 'second string'];
     var output = prettyjson.render(input);