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JS 依照元素出現數量排序

by · 2018-01-26

同樣是最近遇到的狀況，需要利用陣列內元素出現的數量進行排序，以下為範例程式：

var array = ["1", "2", "4", "5", "2", "4", "2", "3"];
var str = array.toString();
var filter = [];
var result = [];
document.write("原始陣列：" + array + "<br>");

var get = function (str, tar, arr, tmp) {
    if (str.indexOf(tar) >= 0) {
        tmp = str.slice(str.indexOf(tar) + 1);
        arr.push(tar);
        get(tmp, tar, arr, tmp);
    }
    return arr;
}

for (i in array) {
    var elm = [];
    var tmp;
    var fstr = filter.join();
    if (fstr.indexOf(array[i]) >= 0) {
        continue;
    } else {
        var tmp_arr = get(str, array[i], elm, tmp);
        result.push(tmp_arr.length + ':' + tmp_arr[0]);
        filter.push(array[i]);
    }
}

result.sort();
result.reverse();

//按照出現次數排序，不刪除重複元素
var finishArray = [];

for (index in result) {
    var show = result[index].split(':');
    for (i = 0; i < show[0]; i++) {
        finishArray.push(show[1]);
    }
}
document.write("按出現次數排序，不刪除重複元素：" + finishArray + "<br>");

//按照出現次數排序，刪除重複元素
var finishArray = [];
for (index in result) {
    var show = result[index].split(':');
    finishArray.push(show[1]);
}
document.write("按出現次數排序，刪除重複元素：" + finishArray + "<br>");

輸出結果：

原始陣列：1,2,4,5,2,4,2,3
按出現次數排序，不刪除重複元素：2,2,2,4,4,5,3,1
按出現次數排序，刪除重複元素：2,4,5,3,1

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