use deno_core::*;
#[op2]
fn op_sum(#[serde] nums: Vec<f64>) -> Result<f64, deno_core::error::AnyError> {
let sum = nums.iter().fold(0.0, |a, v| a + v);
Ok(sum)
}
fn main() {
let ext = Extension {
name: "my_ext",
ops: std::borrow::Cow::Borrowed(&[op_sum::DECL]),
..Default::default()
};
let mut runtime = JsRuntime::new(RuntimeOptions {
extensions: vec![ext],
..Default::default()
});
runtime
.execute_script(
"<usage>",
r#"
// Print helper function, calling Deno.core.print()
function print(value) {
Deno.core.print(value.toString()+"\n");
}
const arr = [1, 2, 3];
print("The sum of");
print(arr);
print("is");
print(Deno.core.ops.op_sum(arr));
// And incorrect usage
try {
print(Deno.core.ops.op_sum(0));
} catch(e) {
print('Exception:');
print(e);
}
"#,
)
.unwrap();
}