[英]Count the occurrence of each word in a phrase using javascript
For example for the input "olly olly in come free"
例如对于输入
"olly olly in come free"
The program should return:程序应该返回:
olly: 2 in: 1 come: 1 free: 1
The tests are written as: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
});
How do I start in my word-count.js file?如何从 word-count.js 文件开始? Create a method words() or a module Words() and make an expectedCount method in there and export it?
创建一个方法 words() 或模块 Words() 并在其中创建一个 expectedCount 方法并导出它?
Do I treat the string as an array or an object?我将字符串视为数组还是对象? In the case of objects, how do I start breaking them into words and iterate for the count?
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?
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"));
This code should get just what you want.这段代码应该得到你想要的。
For more understanding on the code I would advice you to go through array prototype functions and string prototype functions.为了对代码有更多的理解,我建议你通过数组原型函数和字符串原型函数。
For simple understanding of what I`m doing here:为了简单理解我在这里做什么:
split(" ")
based on a space which gives an array.split(" ")
拆分字符串。forEach
method to iterate through all the elements in the spitted array.forEach
方法遍历吐出数组中的所有元素。:?
:?
to check if value already exists, if it does increment by one or assign it to 1. Array.prototype String.prototype Array.prototype String.prototype
Here's how you do it这是你如何做到的
word-count.js字数统计.js
function word-count(phrase){
var result = {}; // will contain each word in the phrase and the associated count
var words = phrase.split(' '); // assuming each word in the phrase is separated by a space
words.forEach(function(word){
// only continue if this word has not been seen before
if(!result.hasOwnProperty(word){
result[word] = phrase.match(/word/g).length;
}
});
return result;
}
exxports.word-count = word-count;
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