JS/ES-實現合併兩個有序數列

js 合併兩個有序數組

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let arr1 = [1,3,59,111];
let arr2 = [2,4,5,6,7,8,9,11,55,66,77,88];

function mergeList(arr1, arr2) {
    let len1 = arr1.length - 1
    let len2 = arr2.length - 1
    let mLen = arr1.length + arr2.length - 1
    while (len1 >= 0 && len2 >= 0) {
        if (arr1[len1] > arr2[len2]) {
            arr2[mLen--] = arr1[len1--]
        } else {
            arr2[mLen--] = arr2[len2--]
        }
    }
    while (len1 >= 0) {
        arr2[mLen--] = arr1[len1--]
    }
    while (len2 >= 0) {
        arr2[mLen--] = arr2[len2--]
    }
    return arr2
}

console.log(mergeList(arr1, arr2))

輸出：