axax/esnext/last.js

A library of async iterator extensions for JavaScript including ```map```, ```reduce```, ```filter```, ```flatMap```, ```pipe``` and [more](https://github.com/jamiemccrindle/axax/blob/master/docs/API.md#functions).

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
/**
 * Take the last value or the last value to pass predicate from an async iterable
 */
function last(predicate = () => true, defaultValue) {
    return async function* inner(source) {
        let lastItem = defaultValue;
        for await (const item of source) {
            if (predicate(item)) {
                lastItem = item;
            }
        }
        if (lastItem) {
            yield lastItem;
        }
    };
}
exports.last = last;