diff --git a/Makefile b/Makefile
deleted file mode 100644
index 36a3ed7..0000000
--- a/Makefile
+++ /dev/null
@@ -1,5 +0,0 @@
-
-test:
-	@echo "populate me"
-
-.PHONY: test
\ No newline at end of file
diff --git a/example.js b/example.js
index 688c29e..5184bb8 100644
--- a/example.js
+++ b/example.js
@@ -1,10 +1,16 @@
 
-var assert = require('./');
+var {assert, is} = require('./')
 
-test();
+test()
 
 function test() {
-  var user = { name: 'tobi' };
-  assert('tobi' == user.name);
-  assert('number' == typeof user.age);
-}
\ No newline at end of file
+  var user = { name: 'tobi'
+	   //, age: 18 // comment-out this line to make an assert test fail
+	   }
+  
+  //assert( ()=>false )
+  assert( ()=>user.name=='tobi', is('user.name',user.name) )
+  assert( ()=>typeof user.age=='number', is('typeof user.age',typeof user.age) )
+  
+  console.log('test ended.')
+}
diff --git a/index.js b/index.js
index fd1c9b7..de887c3 100644
--- a/index.js
+++ b/index.js
@@ -1,38 +1,21 @@
-/**
- * Module dependencies.
- */
 
-var AssertionError = require('assert').AssertionError
-  , callsite = require('callsite')
-  , fs = require('fs')
+module.exports = { assert, is }
 
-/**
- * Expose `assert`.
- */
-
-module.exports = process.env.NO_ASSERT
-  ? function(){}
-  : assert;
-
-/**
- * Assert the given `expr`.
- */
-
-function assert(expr) {
-  if (expr) return;
-
-  var stack = callsite();
-  var call = stack[1];
-  var file = call.getFileName();
-  var lineno = call.getLineNumber();
-  var src = fs.readFileSync(file, 'utf8');
-  var line = src.split('\n')[lineno-1];
-  var src = line.match(/assert\((.*)\)/)[1];
-
-  var err = new AssertionError({
-    message: src,
-    stackStartFunction: stack[0].getFunction()
-  });
+function assert(test_function,debug_facts=null){
+	if(typeof debug_facts=='function') debug_facts=debug_facts()
+	if(test_function()!==true){
+		throw new Error('Assertion {'+
+		test_function.toString().split('=>')[1]+
+		'} is false!'+
+		(debug_facts==null?'':(' in fact ... '+debug_facts)))
+	}
+}
 
-  throw err;
+function is(what, iswhat){
+	var repr=iswhat.toString()
+	if(typeof repr=='undefined') repr=JSON.stringify(iswhat)
+	return what+' is '+repr
 }
+
+var name='richard'
+assert(()=>name=='richard','name is '+name)
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..76b741f
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,5 @@
+{
+    "name": "better-assert",
+    "version": "1.0.3",
+    "lockfileVersion": 1
+}
diff --git a/package.json b/package.json
index e270f5e..735239a 100644
--- a/package.json
+++ b/package.json
@@ -12,11 +12,9 @@
     "author": "TJ Holowaychuk <tj@vision-media.ca>",
     "contributors": [
         "TonyHe <coolhzb@163.com>",
-        "ForbesLindesay"
+        "ForbesLindesay",
+        "Dario Cangialosi"
     ],
-    "dependencies": {
-        "callsite": "1.0.0"
-    },
     "repository": {
         "type": "git",
         "url": "https://github.com/visionmedia/better-assert.git"