duktape/tests/perf/test-prop-write.py

def test():
    obj = { 'xxx1': 1, 'xxx2': 2, 'xxx3': 4, 'xxx4': 4, 'foo': 123 }
    i = 0
    while i < 1e7:
        obj['foo'] = 234
        obj['foo'] = 234
        obj['foo'] = 234
        obj['foo'] = 234
        obj['foo'] = 234
        obj['foo'] = 234
        obj['foo'] = 234
        obj['foo'] = 234
        obj['foo'] = 234
        obj['foo'] = 234
        i += 1

test()