@mikezimm/fps-core-v7/lib/logic/Arrays/searching/getNextIndex.js

Library of reusable core interfaces, types and constants migrated from fps-library-v2

/**
 * This will get the next zero-based index based on the length of an array
 *    by default it looks forward but if back===true looks backwards
 *    if going forward past the end it cycles back to zero
 *
 * @param length
 * @param current
 * @param back
 * @returns
 */
export function getNextIndex(length, current, back = false) {
    if (back === false) {
        return current === length - 1 ? 0 : current + 1;
    }
    else {
        return current === 0 ? length - 1 : current - 1;
    }
}
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