Easily export functions written in C and import them into JavaScript.
Let's first create a simple C program that exports an "add" function:
#include <webassembly.h>
export int add(int a, int b) {
return a + b;
}Next, include WASM into the head then use WASM to import our function:
<head>
<script src="wasm.js"></script>
</head>
<body>
<script>
wasm('program.wasm').then(({ add } ) => {
console.log(add(1, 2)); // 3
});
</script>
</body>Now convert the C to WASM and launch a local dev server by running:
$ npm start
Launch your browser (localhost:8080) and open your console!
When you run "npm start" you're actually running these two commands:
$ npx wa compile -o program.wasm program.c
$ php -S localhost:8080
The first one will compile "program.c" into "program.wasm".
The second command will launch a PHP server on port 8080.
I'm currently working on adding a Node server with live reload.