Add eval examples

Author: wiwichips

function-passing-eval.py

@@ -0,0 +1,12 @@
+#!/usr/bin/env python3
+"""
+This example demonstrates passing functions as arguments. Here, a
+function is deinfed in JavaScript which expects a function as an
+argument. Then that JavaScript function is executed from Python and
+the Python `print` function  is passed as an argument.
+"""
+
+import pythonmonkey as pm
+hello = pm.eval("(func) => { func('Hello, World!'); }")
+hello(print) # this outputs "Hello, World!"
+

hello-world-eval.py

@@ -0,0 +1,12 @@
+#!/usr/bin/env python3
+"""
+This example returns a "HELLO, WORLD!" string created in JavaScript
+using `pm.eval` for execting the JavaScript code.
+The string is set to uppercase using JavaScript's `toUpperCase`
+function.
+"""
+
+import pythonmonkey as pm
+hello = pm.eval(" 'Hello, World!'.toUpperCase(); ")
+print(hello) # this outputs "HELLO, WORLD!"
+