@reactivex/ix-esnext-esm/iterable/operators/defaultifempty.js

The Interactive Extensions for JavaScript

import { IterableX } from '../iterablex';
export class DefaultIfEmptyIterable extends IterableX {
    constructor(source, defaultValue) {
        super();
        this._source = source;
        this._defaultValue = defaultValue;
    }
    *[Symbol.iterator]() {
        let state = 1;
        for (const item of this._source) {
            state = 2;
            yield item;
        }
        if (state === 1) {
            yield this._defaultValue;
        }
    }
}
export function defaultIfEmpty(defaultValue) {
    return function defaultIfEmptyOperatorFunction(source) {
        return new DefaultIfEmptyIterable(source, defaultValue);
    };
}

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