Calculate simple moving average in Rust and targeting WASM.

lib.rs

use wasm_bindgen::prelude::*;

// When the `wee_alloc` feature is enabled, use `wee_alloc` as the global
// allocator.
#[cfg(feature = "wee_alloc")]
#[global_allocator]
static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;

#[wasm_bindgen]
extern "C" {
    #[wasm_bindgen(js_namespace = console)]
    fn log(s: String);
}

#[wasm_bindgen]
pub fn simple_moving_average(array_prices: Vec<f64>, window: f64) -> Vec<f64> {
    let interval = window as usize;
    let mut index = interval - 1;
    let length = array_prices.len() + 1;
    
    let mut results = Vec::new();

    while index < length {
        index = index + 1;

        let start_index = index - interval;
        let interval_slice = &array_prices[start_index..index-1];
        let sum: f64 = interval_slice.iter().sum();
        let interval_float = interval as f64;
        results.push(sum / interval_float);
    }

    return results;
}