计算javascript中的单词并将其推入对象 [英] Counting words in javascript and push it into an object

问题描述

我想实现一个javascript程序，通过单词计算并返回单词及其出现的次数，例如{hello：2，@ hello：1，world：1，toString：1}

I want to achieve a javascript program that count through a word and return the word and the number of times it appears eg {hello : 2, "@hello":1, world : 1, toString:1}

下面是我的代码，但我只得到总字数

below is my code but i only get the total number of words

function words(str) { 
    app = {};
    return str.split(" ").length;
}

console.log(words("hello world"));   

推荐答案

使用reduce来迭代单词数组，并计算实例：

Use reduce to iterate the words array, and count the instances:

function words(str) { 
    return str.split(" ").reduce(function(count, word) {
      count[word] = count.hasOwnProperty(word) ? count[word] + 1 : 1;
      
      return count;
    }, {});
}

console.log(words("reserved words like prototype and toString ok? Yes toString is fine"));

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