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

The Interactive Extensions for JavaScript

export async function single(source, predicate = () => true) {
    let result;
    let hasResult = false;
    let i = 0;
    for await (const item of source) {
        if (hasResult && (await predicate(item, i++))) {
            throw new Error('More than one element was found');
        }
        if (await predicate(item, i++)) {
            result = item;
            hasResult = true;
        }
    }
    return result;
}

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