/**
 * @license
 * Copyright 2021 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */
/**
 * Returns an iterable containing the result of calling `f(value)` on each
 * value in `items`.
 *
 * @example
 *
 * ```ts
 * render() {
 *   return html`
 *     <ul>
 *       ${map(items, (i) => html`<li>${i}</li>`)}
 *     </ul>
 *   `;
 * }
 * ```
 */
function* map(items, f) {
    if (items !== undefined) {
        let i = 0;
        for (const value of items) {
            yield f(value, i++);
        }
    }
}

export { map };
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