使用javascript计算字符串中字符的频率 [英] counting frequency of characters in a string using javascript

问题描述

我需要编写某种循环来计算字符串中每个字母的频率。

I need to write some kind of loop that can count the frequency of each letter in a string.

例如：aabsssd

输出：a：2，b：1，s：3，d：1

output: a:2, b:1, s:3, d:1

还想将相同的字符映射为属性名称在对象中。有什么好主意怎么做？

Also want to map same character as property name in object. Any good idea how to do this?

我不知道怎么做。

这是哪里我到目前为止：

This is where I am so far:

var arr = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"];

function counter(x) {
    var count=0, temp = [];
    x = x.split('');
    console.log(x);
    for(var i=0, len = x.length; i < len; i++) {
        if(x[i] == "a") {
            count++;
        }
    }
    return count;
}
var a = "aabbddd";
console.log(counter(a));

推荐答案

在这里：

function getFrequency(string) {
    var freq = {};
    for (var i=0; i<string.length;i++) {
        var character = string.charAt(i);
        if (freq[character]) {
           freq[character]++;
        } else {
           freq[character] = 1;
        }
    }

    return freq;
};

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