Git+node.js+TDD

环境要求

• Git
• node.js
• jasmine
• TDD

git安装及命令学习

• 安装直接在Git官网下载默认选项安装
• 命令行学习https://try.github.io/levels/1/challenges/1

node.js 安装

• 直接下载默认安装，需要注意npm的安装位置
• 运行一个Hello World的js程序
• 学习js语法 http://codefordream.com/courses/js_basic/sections

jasmine

• 在npm下安装jasmine

npm install -g jasmine

• 熟悉jasmine命令

jasmine init

TDD

• TDD测试开发了解 http://www.jianshu.com/p/62f16cd4fef3

Frequency Number需求：

我想要一个nodejs小程序，它可以帮我处理一段字符串信息，这段字符串信息是由英文单词组成，每两个单词之间有空格，处理结果也为一段字符串，这个字符串应该每行只显示一个单词和它的数量，并且按出现频率倒序排列

example:

• input:

“it was the age of wisdom it was the age of foolishness it is”```
- **output:**

it 3
was 2
the 2
age 2
of 2
wisdom 1
foolishness 1
is 1

###分解问题

![279826-b97e82b391b62775.jpg](http:https://img.haomeiwen.com/i5365889/da633dcbc50de8f8.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

###测试分块
- "" => ""
- "it" => "it 1"，一个单词，驱动出格式化字符串的代码
- "it was" => "it 1\r\nwas 1"，两个不同单词，驱动出分割单词的代码
- "it it was" => "it 2\r\was 1"，有相同单词，驱动出分组代码
- "it was was" => "was 2\r\nit 1"，驱动出分组后的排序代码
- "it     was" => "it 1\r\nis was"，多个空格，完善分割单词的代码
###测试代码
- **main.js**

function main(words) {
if(words!=='')
{
let wordArray=words.split(/\s+/)
let groupWords=group(wordArray)
sort (groupWords);
return groupWords.map((e)=>format(e.word,e.count)).join('\r\n')
}
return ''
}
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 sort =function(groupWords){
groupWords.sort((x,y)=>y.count-x.count)
};

var format=function(word,count)
{
return word+' '+count
}
module.exports = main

- **test.js**

describe("Word Frequency", function() {
var main = require('../../lib/my_spec/main.js')

it('returns empty string given empty string',function(){
    var result=main('')
    var expect_string=''
    expect(expect_string).toEqual(result)
})

it('returns string given one word',function()
{
var result=main('it')
expect(result).toEqual('it 1')

})

it('returns string given two different words',function()
{
    var result=main('it was')
    expect(result).toEqual('it 1\r\nwas 1')
})

it('returns string given duplicated different words',function()
{
    var result=main('it it was')
    expect(result).toEqual('it 2\r\nwas 1')
})

it('returns string given duplicated different words need to be sorted',function()
{
    var result=main('it was was')
    expect(result).toEqual('was 2\r\nit 1')
})

it('returns string given words splited by multiple spaces',function()
{
    var result=main('it   was')
    expect(result).toEqual('it 1\r\nwas 1')
})

it('returns string given full words ',function()
{
    var result=main('it was the age of wisdom it was the age of foolishness it is')
    expect(result).toEqual('it 3\r\nwas 2\r\nthe 2\r\nage 2\r\nof 2\r\nwisdom 1\r\nfoolishness 1\r\nis 1')
})

})

- **git**

![Paste_Image.png](http:https://img.haomeiwen.com/i5365889/ae4de390bf0c5d7f.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

- **jasmine**
![Paste_Image.png](http:https://img.haomeiwen.com/i5365889/0a70c3b57ab7fedc.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

##总结
- 在环境安装上花费了大量时间，总是出现很细小的错误导致自己 不断重来浪费了时间，对于英语比以前弱了，好多东西都要看好久才知道。
- 在写实现函数时构思不够好，好多都是处于初级阶段，优化方法很少甚至没有，看了教练的视频才着手改正优化自己的函数。
- 对js语法非常不熟练，会因为找资料浪费时间打断思路
- 发现写东西时不够细心，会因为一个小错误找半天，而且是一般不犯的错误。

##仓库链接
https://github.com/heeray/words