convert python to js online code example

Example 1: convert js to python online

>>> import js2py
>>> f = js2py.eval_js('function f(x) {return x + x}')
>>> f(2)
4
>>> f()
nan
>>> f(f)
function f(x) { [python code] }function f(x) { [python code] }

Example 2: convert python to js online

let test = [];