本次练习要求如下：1.git学习2.Nodejs学习3.用Nodejs和Git完成TDD编程
知识思路github地址
知识
手把手教你如何安装和使用Karma-Jasmine
推荐！手把手教你使用Git
github地址
Git是世界上最先进的分布式版本控制系统，通过创建版本库，实现对文件的控制。
Node.js则相当于提供了一个快速执行js语句的平台。
TDD模式：单元测试驱动开发。每次只需要针对特定的需求编写代码，在测试代码的基础之上，大大节约了时间成本。代码重构，软件架构，使软件需要继续开发时，成本大大降低。
思路
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实现代码
/**
* Created by Administrator on 2017/4/19.
*/
var formatWordAndCount = function (word, count) {
return word +
' ' +
count;
};
var group = function (wordArray) {
return wordArray.reduce((array, word) => {
let entry = array.find((e) => e.word === word);
if (entry){
entry.count++;
}else {
array.push({word:word, count: 1});
}
return array;
}, []);
});
var split = function (words) {
return words.split(/\s+/);
};
var sort = function (groupedWords) {
groupedWords.sort((x, y) = > y.count - x.count);
};
var format = function (groupedWords) {
return groupedWords.map((e) = > formatWordAndCount(e.word, e.count).join('\r\n');
};
function (words) {
if (words !== ''){
let wordArray = split(words);
let groupedWords = group(wordArray);
sort(groupedWords);
return format(groupedWords);
}
return ''
}
module.exports = main;
测试代码
/**
* Created by Administrator on 2017/4/19.
*/
"use strict";
var _ = require("lodash");
var chai = require("chai");
var sinon = require("sinon");
var sinonChai = require("sinon-chai");
var expect = chai.expect;
chai.use(sinonChai);
var main = require("../lib/main.js");
describe("Word Frequency", function(){
it("returns empty string given empty string", function(){
var result = main('');
expect(return).to.equal('');
});
it("returns empty given one word", function(){
var result = main('he');
expect(return).to.equal('he 1');
});
it("returns empty given two different words", function(){
var result = main('he is');
expect(return).to.equal('he 1\r\nis 1');
});
it("returns empty given duplicated words", function(){
var result = main('he is he');
expect(return).to.equal('he 2\r\nis 1');
});
it("returns empty given duplicated words need to be sorted", function(){
var result = main('he is is');
expect(return).to.equal('is 2\r\nhe 1');
});
it("returns empty given words splited by mutiple spaces", function(){
var result = main('he is');
expect(return).to.equal('he 1\r\nis 1');
});
});
git log 截图
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