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# Receiving JavaScript Closures in Exported Rust Functions
You can use the `js-sys` crate to access JavaScript's `Function` type, and
invoke that function via `Function.prototype.apply` and
`Function.prototype.call`.
For example, we can wrap a `Vec<u32>` in a new type, export it to JavaScript,
and invoke a JavaScript closure on each member of the `Vec`:
```rust
use wasm_bindgen::prelude::*;
#[wasm_bindgen]
pub struct VecU32 {
xs: Vec<u32>,
}
#[wasm_bindgen]
impl VecU32 {
pub fn each(&self, f: &js_sys::Function) {
let this = JsValue::null();
for &x in &self.xs {
let x = JsValue::from(x);
let _ = f.call1(&this, &x);
}
}
}
```
Since Rust has no function overloading, the `call#` method also requires a
number representing the amount of arguments passed to the JavaScript closure.
Version data entries
30 entries across 30 versions & 1 rubygems