I am trying to use a Web API that contains a method which accepts an array of strings from Rust.
I am using web_sys to "talk" to the JS API, but I can't find a way to pass in an array of static Strings into it.
In Rust, unfortunately, the type of the parameter is mistakenly declared as arg: &JsValue, so I can pass just about anything into it and it still compiles, but crashes in the browser.
How can I create an array of strings in Rust that can be used as a &JsValue?
This converts &[&str] to JsValue:
fn js_array(values: &[&str]) -> JsValue {
return JsValue::from(values.into_iter()
.map(|x| JsValue::from_str(x))
.collect::<Array>());
}
With the use of js_sys you can create arrays like this:
use js_sys::Array;
#[wasm_bindgen]
pub fn strings() -> Array {
let arr = Array::new_with_length(10);
for i in 0..arr.length() {
let s = JsValue::from_str(&format!("str {}", i));
arr.set(i, s);
}
arr
}
But can you give an example with string literals like ["hello"].to_array()
For the requested example you cannot use any method to convert directly. Therefore, you have to use a helper function:
#[wasm_bindgen]
pub fn strings() -> Array {
to_array(&["str 1", "str 2"])
}
pub fn to_array(strings: &[&str] ) -> Array {
let arr = Array::new_with_length(strings.len() as u32);
for (i, s) in strings.iter().enumerate() {
arr.set(i as u32, JsValue::from_str(s));
}
arr
}
["hello"].to_array()?
&JsValue, not an Array so the code does not compile. Doing JsValue::from(array) does not seem to be working.