Examples
The Jstz source code repository contains many example smart functions and applications that use them:
https://github.com/jstz-dev/jstz/tree/main/examples
Here are summaries of some of the larger examples:
Example smart functions
Hello world
The hello-world smart function accepts a name and returns a hello world message to the account that called it.
Counter
The counter smart function is a simple smart function that stores a number and allows callers to retrieve the number, add one to it, or subtract one to it.
Because nothing aside from the smart function itself can change the number, it demonstrates how a smart function can store persistent data that no other source can manipulate.
For a walkthrough of setting up and deploying this smart function, see the Quick start.
get-tez
The get-tez smart function shows you how smart functions can receive, store, and transfer tez, the primary currency of Jstz and Tezos.
The smart function sends 1 tez to any account that asks, as long as it has enough and the account has not received too many tez.
You can use this example to see how tez works on Jstz and how smart functions work with tez. Because it keeps track of the messages it receives and the accounts that it has sent tez to, it's also an example of how smart functions store data.
FA2 token
The fa2 smart function is an implementation of the Tezos FA2 standard for tokens.
FA2 tokens can be fungible (interchangeable, like other currencies) or non-fungible (unique and not interchangeable).
The smart function allows you to create FA2 tokens, transfer them between accounts, and get the balance of tokens in an owner's account.
In this way, you can create tokens to represent anything that you want them to represent.
For more information about FA2 tokens, see FA2 tokens on docs.tezos.com.
URL shortener
The url_shortener smart function stores long URLs with a shortcode and returns the full URL when you send the shortcode.
Other examples
Many other example smart functions are available in the examples folder to illustrate different things that you can do with Jstz:
https://github.com/jstz-dev/jstz/tree/main/examples
Example web applications
Web application with wallet integration
The example web-call-to-jstz is a web application that signs transactions with the Jstz development wallet.
It requires you to install the dev wallet as described in the repository README: https://github.com/jstz-dev/dev-wallet.
It calls the Counter smart function, but you could change it to call other smart functions.
For a walkthrough of setting up and running this application, see the Quick start.
Simple web application
The example call-from-web is a simple web application that shows how you can call a Jstz smart function from a web application.
It calls the Counter smart function, but you could change it to call other smart functions.
This application hard-codes the private key of an account to use to sign transactions to the smart function. That makes this example appropriate only for development and testing when you don't need to simulate real user interaction. Do not encode private keys like this. For an example that uses a wallet, see the Web application with wallet integration.
Other examples
show-tez
The show-tez is a command-line application that is a companion to the get-tez example.
It allows users to send and receive requests to a running copy of the get-tez smart function.
Users can request tez from the get-tez smart function and check the log of the messages that they have sent previously.