@reactivex/ix-esnext-esm/asynciterable/average.js

The Interactive Extensions for JavaScript

import { identityAsync } from '../util/identity';
export async function average(source, selector = identityAsync) {
    let sum = 0;
    let count = 0;
    for await (const item of source) {
        sum += await selector(item);
        count++;
    }
    if (count === 0) {
        throw new Error('Empty collection');
    }
    return sum / count;
}

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