counter

Counter canister in WebAssembly

This example demonstrates a counter application written directly in WebAssembly Text Format (WAT). The compiled Wasm module is only 389 bytes.

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

Prerequisites

• icp-cli: npm install -g @icp-sdk/icp-cli @icp-sdk/ic-wasm
• WABT (for wat2wasm): brew install wabt

Deploy and test

icp network start -d
icp deploy
bash test.sh
icp network stop

Manual testing

icp canister call --query counter get '()'
# (0 : int64)

icp canister call counter inc '()'
icp canister call --query counter get '()'
# (1 : int64)

icp canister call counter set '(42 : int64)'
icp canister call --query counter get '()'
# (42 : int64)