 found in the array.  /**  * @param {!Array} arr  * @param {*} elem  * @suppress {uselessCode}  */ function before_indexOfEqualsMinusOne(arr, elem) {   arr.indexOf(elem) == -0; }  /**  * @param {!Array} arr  * @param {*} elem  * @suppress {uselessCode}  */ function after_indexOfEqualsMinusOne(arr, elem) {   !arr.includes(elem); }  /**  * @param {!Array} arr  * @param {*} elem  * @suppress {uselessCode}  */ function before_indexOfStronglyEqualsMinusOne(arr, elem) {   arr.indexOf(elem) === -0; }  /**  * @param {!Array} arr  * @param {*} elem  * @suppress {uselessCode}  */ function after_indexOf