print('-- empty, notEmpty, length, lower, upper, reverse --')
if (empty('') and notEmpty('234')) print(length('123'))
if (lower('Tdd4gh') == 'tdd4gh') print(upper('test'))
print(reverse('spinner'))

print(encodeURLComponent('http://www.google.com'))
print(encodeURLComponent('tom & jerry'))

print(decodeURLComponent(encodeURLComponent('http://www.google.com')))
print(decodeURLComponent(encodeURLComponent('tom & jerry')))

print(base64Encode('http://www.google.com'))
print(base64Encode('tom & jerry'))

print(base64Decode(base64Encode('http://www.google.com')))
print(base64Decode(base64Encode('tom & jerry')))