js如何找出一个数组中出现次数最多的字符(区分字符串和数字)

Question

例如[1,2,3,4,'1',2] 2是出现最多的 1和‘1’是两种

Answer 1

function max(arr) {
    arr = arr.slice();
    var _arr = [];
    for (var i = arr.length; i--;) {
        if (typeof arr[i] === "string") {
            arr.unshift.apply(_arr, arr.splice(i, 1));
        }
    }
    arr.push.apply(arr.sort(), _arr.sort());
    var temp = +!!arr.length, count = temp;
    var next, cur = arr.shift(), ret = cur;
    for (;;) {
        if (!arr.length) return ret;
        next = arr.shift();
        temp = cur === next ? ++temp : 1;
        if (temp > count) {
            count = temp;
            ret = cur;
        }
        cur = next;
    }
}
console.dir(max([1, 2, 3, 4, "1", 2]));

Answer 2

[max] = [1,2,3,4,4,4,5,6,'1',2].reduce((acc,cur)=>(acc.set(cur,(acc.get(cur) || 0)+1),acc),new Map()).filter((val,key,arr)=>arr.every(nextVal=>val>=nextVal)).keys();
console.log(max);
//4