检查数组中是否有重复的值，获取值并获取计数 [英] Check an array for duplicate values, get value and get count

问题描述

我已将随机数量的字符串推入数组。

I have pushed a random amount of strings into an array.

var array = ["car", "plane", "plane", "car", "car"];

Id喜欢检索Arrays值并获得将它们推入Array的次数。
i.E

Id like to retrieve the Arrays values and get the amount of times they were pushed into the Array. i.E

var a = "car";
var aCount = 3;
var b = "plane";
var bCount = 2;

var text = "'" + a + "'" + " was found " + aCount + " times";
return text

我看不到如何使用循环比较数组[i]以及数组的所有其他值，尤其是考虑到的array.length是随机确定的吗？

I dont see how i can use a loop to compare array[i] with all the other values of the array, especially considerung array.length is randomly determined ?

谢谢

推荐答案

使用设置为数组值的键创建一个对象并开始计数！

Create an object with the keys set as the array values and start counting!

var arrayMap = {};
for (var i = 0; i < array.length; i++) {
    if (arrayMap.hasOwnProperty(array[i])) {
        arrayMap[array[i]]++;
    } else {
        arrayMap[array[i]] = 1;
    }
}

arrayMap 现在将拥有所有数组值的计数。

arrayMap will now have a count of all your array values.

演示： http://jsfiddle.net/oe0x6dbg/

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