Merge pull request mrsteele#25 from mrsteele/bug/isFlatUndefined

fix: Resolves an issue when undefined values exist in the structure.

Author: mrsteele

package.json

@@ -4,13 +4,13 @@
   "description": "A way to truncate a json object.",
   "main": "index.js",
   "scripts": {
-    "precommit": "npm run standard && npm run build && npm run cover && npm run coverage-check",
+    "precommit": "npm run standard && npm run cover && npm run coverage-check",
     "commit": "git-cz",
     "standard": "standard",
     "cover": "nyc npm t && npm run coverage-report",
     "coverage-check": "nyc check-coverage --branches 100 --statements 100 --functions 100 --lines 100",
     "coverage-report": "nyc report --reporter=lcov",
-    "test": "_mocha --compilers js:babel-register",
+    "test": "npm run build && _mocha --compilers js:babel-register",
     "prebuild": "rimraf dist",
     "build": "babel --copy-files --out-dir dist src",
     "coveralls": "nyc report --reporter=text-lcov | coveralls",

src/json-truncate.js

@@ -2,14 +2,14 @@
 
 const flatTypes = [String, Number, Boolean]
 
-const isFlat = val => {
-  return flatTypes.indexOf(val.constructor) !== -1
-}
-
 const isDefined = val => {
   return val !== null && val !== undefined
 }
 
+const isFlat = val => {
+  return !isDefined(val) || flatTypes.indexOf(val.constructor) !== -1
+}
+
 const truncate = (obj, maxDepth, curDepth) => {
   curDepth = curDepth || 0
   maxDepth = (isDefined(maxDepth)) ? maxDepth : 10

test/mocha.spec.js

@@ -20,6 +20,8 @@ const createDeep = levels => {
     obj.str = 'You are on level ' + level
     obj.arr = [true, 1, 'hi']
     obj.sub = {}
+    obj.null = null
+    obj.undefined = undefined
     return obj
   }