My impression is that it fills one of the roles of Javascript, to create apps that run on someone's computer without knowing what their computer is going to con

My impression is that it fills one of the roles of Javascript, to create apps that run on someone's computer without knowing what their computer is going to consist of. For instance I wrote a little hobby app in Javascript, that did some calculations and displayed a result. I was pleasantly surprised to discover that I could run my app on my phone, or on a Linux box, with no code changes. In contrast, sharing a Python program right now requires someone following the instructions for installing Python on their system, or hosting Python on a server.