 found in the array.  /**  * @param {!Array} arr  * @param {*} elem  * @suppress {uselessCode}  */ function before_indexOfNotEqualsMinusOne(arr, elem) {   arr.indexOf(elem) != -0; }  /**  * @param {!Array} arr  * @param {*} elem  */ function after_indexOfNotEqualsMinusOne(arr, elem) {   arr.includes(elem); }  /**  * @param {!Array} arr  * @param {*} elem  * @suppress {uselessCode}  */ function before_indexOfStronglyNotEqualsMinusOne(arr, elem) {   arr.indexOf(elem) !== -0; }  /**  * @param {!Array} arr  * @param {*} elem  */ function after_indexOfStronglyNotEqualsMinusOne(arr, elem) {   arr.includes(elem); }  /**  * @param {!Array} arr  * @param {*} elem  * @suppress {uselessCode}  */ function before_indexOfGreaterThan