Source: item-selector-taglib/src/main/resources/META-INF/resources/utils/utils.es.js

/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

/**
 * Utility function for substituting variables into language keys.
 *
 * Examples:
 * sub(Liferay.Language.get('search-x'), ['all'])
 * => 'search all'
 * sub(Liferay.Language.get('search-x'), [<b>all<b>], false)
 * => 'search <b>all</b>'
 *
 * @param {string} langKey This is the language key used from our properties file
 * @param {string} args Arguments to pass into language key
 * @param {string} join Boolean used to indicate whether to call `.join()` on
 * the array before it is returned. Use `false` if subbing in JSX.
 * @return {(string|Array)}
 */
export function sub(langKey, args) {
	const SPLIT_REGEX = /({\d+})/g;

	const keyArray = langKey
		.split(SPLIT_REGEX)
		.filter((val) => val.length !== 0);

	for (let i = 0; i < args.length; i++) {
		const arg = args[i];

		const indexKey = `{${i}}`;

		let argIndex = keyArray.indexOf(indexKey);

		while (argIndex >= 0) {
			keyArray.splice(argIndex, 1, arg);

			argIndex = keyArray.indexOf(indexKey);
		}
	}

	return keyArray.join('');
}