feishin/src/renderer/utils/shuffle.ts

export function shuffle<T>(array: T[]): T[] {
    // Create a copy of the array to avoid mutating the original
    const shuffled = [...array];

    // Loop through the array from the last element to the first
    for (let i = shuffled.length - 1; i > 0; i--) {
        // Generate a random index from 0 to i
        const j = Math.floor(Math.random() * (i + 1));
        // Swap elements at positions i and j
        [shuffled[i], shuffled[j]] = [shuffled[j], shuffled[i]];
    }

    return shuffled;
}

export function shuffleInPlace<T>(array: T[]): T[] {
    for (let i = array.length - 1; i > 0; i--) {
        const j = Math.floor(Math.random() * (i + 1));
        [array[i], array[j]] = [array[j], array[i]];
    }
    return array;
}