axax/esnext/first.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 first value or the first value to pass predicate from an async iterable
 */
function first(predicate = () => true) {
    return async function* inner(source) {
        for await (const item of source) {
            if (predicate(item)) {
                yield item;
                break;
            }
        }
    };
}
exports.first = first;