JS排序算法(冒泡排序、快速排序、插入排序、选择排序)

let arrayList = [1,4,3,2,6,5]

/**
 * 快速排序
 *
 * */

function quickSort (arrayList){
    
    
    let copyArrayList = [...arrayList]
    if (copyArrayList.length < 2 )return copyArrayList

    let povit = copyArrayList[0]
    let smallArrayList = []
    let bigArrayList = []
    for (let i = 1;i<copyArrayList.length;i++){
    
    
        if (copyArrayList[i] < povit){
    
    
            smallArrayList.push(copyArrayList[i])
        }else {
    
    
            bigArrayList.push(copyArrayList[i])
        }
    }
    return [...quickSort(smallArrayList),povit,...quickSort(bigArrayList)]
}

console.log('快速排序',quickSort(arrayList))


/**
 *
 * 冒泡排序
 * 首先每一位一次顺序对比 找到最大数移到最后一位
 * 重复上面步骤
 * 改进方法 再次循环时候可以不计数前面的已经排序过的 i < bubbingArrayList.length - j - 1
 *
 * */
let bubbingArrayList = [1,4,3,2,6,5]
function bubbingSort (bubbingArrayList){
    
    
    for (let j = 0;j<bubbingArrayList.length;j++) {
    
    
        for(let i = 0;i<bubbingArrayList.length;i++) {
    
    
            if (bubbingArrayList[i] > bubbingArrayList[i+1]) {
    
    
                let temp = bubbingArrayList[i]
                bubbingArrayList[i] = bubbingArrayList[i+1]
                bubbingArrayList[i+1] = temp
            }
        }
    }
    return bubbingArrayList
}

console.log('冒泡排序',bubbingSort(bubbingArrayList))

/**
 *
 * 选择排序
 *
 * */

let selectArrayList = [1,4,3,2,6,5]

function selectSort (selectArrayList){
    
    
    for (let i = 0;i<selectArrayList.length;i++ ){
    
    
        let minIndex = i
        for (let j = i + 1 ;j<selectArrayList.length;j++){
    
    
            if(selectArrayList[j] < selectArrayList[minIndex]) {
    
    
                minIndex = j
            }
        }
        let temp = selectArrayList[i]
        selectArrayList[i] = selectArrayList[minIndex]
        selectArrayList[minIndex] = temp
    }
    return selectArrayList
}


console.log('选择排序',selectSort(selectArrayList))


/**
 * 插入排序
 * */

let insertArrayList = [1,4,3,2,6,5]

function insertSort (insertArrayList){
    
    
    for(let i = 1;i<insertArrayList.length;i++){
    
    
        let leftIndex = i - 1
        let temp = insertArrayList[i]
        while (leftIndex >= 0 && insertArrayList[leftIndex] > temp) {
    
    
            insertArrayList[leftIndex + 1] = insertArrayList[leftIndex]
            leftIndex--
        }
        insertArrayList[leftIndex + 1] = temp
    }
    return insertArrayList
}

console.log('插入排序',insertSort(insertArrayList))