如何在javascript中计算数组中的重复值 [英] How to count duplicate value in an array in javascript

问题描述

目前，我得到了一个这样的数组:

Currently, I got an array like that:

var uniqueCount = Array();

几步后，我的数组看起来像这样:

After a few steps, my array looks like that:

uniqueCount = [a,b,c,d,d,e,a,b,c,f,g,h,h,h,e,a];

如何计算数组中有多少 a,b,c?我希望得到如下结果:

How can I count how many a,b,c are there in the array? I want to have a result like:

a = 3
b = 1
c = 2
d = 2

等

推荐答案

function count() {
    array_elements = ["a", "b", "c", "d", "e", "a", "b", "c", "f", "g", "h", "h", "h", "e", "a"];

    array_elements.sort();

    var current = null;
    var cnt = 0;
    for (var i = 0; i < array_elements.length; i++) {
        if (array_elements[i] != current) {
            if (cnt > 0) {
                document.write(current + ' comes --> ' + cnt + ' times<br>');
            }
            current = array_elements[i];
            cnt = 1;
        } else {
            cnt++;
        }
    }
    if (cnt > 0) {
        document.write(current + ' comes --> ' + cnt + ' times');
    }

}

count();

演示小提琴

您也可以使用高阶函数来进行操作. 查看此答案

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