How can I detect which javascript engine (v8 or JSC) is used at runtime in Android?

Question

Newer versions of Android ( > 2.2) include the v8 javascript engine, while older versions only had JSC. However, according to http://blogs.nitobi.com/joe/2011/01/14/android

Answer 1

var s = '';
for (x in {
    3: 3,
    1: 1
  }) {
  s += x
}
if (s === '31') {
  alert('JSC');
} else {
  alert('V8');
}

By the way this will categorize Firefox as 'JSC' and newer IE versions will look like V8.

My blog post has more V8 sniffing tricks: http://erikcorry.blogspot.dk/2012/12/which-version-of-v8-do-i-have.html