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Counter canister in WebAssembly

This example demonstrates a counter application, written in WebAssembly directly. The compiled Wasm module is only 389 bytes.

It can be a good way to learn and experiment with the IC system API.

Prerequisites

Install the wat2wasm tool, which is part of WABT. For example, on Mac, you can run the following command:

$ brew install wabt

Build

$ dfx start [--background]
$ dfx deploy [--no-wallet] counter

$ dfx canister call counter get
(0 : int64)
$ dfx canister call counter inc
()
$ dfx canister call counter get
(1 : int64)
$ dfx canister call counter set '(42)'
()
$ dfx canister call counter get
(42 : int64)

Prerequisites
Build