例如对于输入olly olly in come free"
程序应该返回:
olly: 2在:1来:1免费:1
测试写成:
var words = require('./word-count'); describe("words()", function() { it("counts one word", function() { var expectedCounts = { word: 1 }; expect(words("word")).toEqual(expectedCounts); }); //more tests here });如何从我的 word-count.js 文件开始?创建一个方法 words() 或一个模块 Words() 并在其中创建一个 expectedCount 方法并导出它?
How do I start in my word-count.js file? Create a method words() or a module Words() and make an expectedCount method in there and export it?
我将字符串视为数组还是对象?在对象的情况下,我如何开始将它们分解成单词并迭代计数?
Do I treat the string as an array or an object? In the case of objects, how do I start breaking them into words and iterate for the count?
推荐答案 function count(str) { var obj = {}; str.split(" ").forEach(function(el, i, arr) { obj[el] = obj[el] ? ++obj[el] : 1; }); return obj; } console.log(count("olly olly in come free"));这段代码应该能得到你想要的.为了更好地理解代码,我建议您通过数组原型函数和字符串原型函数.为了简单了解我在这里做什么:
This code should get just what you want. For more understanding on the code I would advice you to go through array prototype functions and string prototype functions. For simple understanding of what I`m doing here:
Array.prototypeString.prototype
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