Two small things, feel the gap with the great God

This is a short passage , Share your feelings about two small things .

1

I wrote a cartoon last year 《 Kangxi couldn't learn binary 》, Describes the development of binary and Boolean algebra , Finally, Shannon discovered the relationship between Boolean algebra and logic circuit , Laid the foundation for the development of computer . 

My cartoon science popularization will stop here , It's over . 

I am reading the book of Mr. Wu Jun recently 《 Soul of calculation 》, I found that he was telling this story too , Here comes curiosity , Take a close look at . 

The story is similar , Nothing new , But the following summary has put forward a refreshing point of view ：

Shannon's circuit design idea can be summarized as “ modularization ” and “ Equivalence ”. 

So-called modularization Is to use a small number of simple modules to build a variety of complex functions , This is also the core guiding ideology of today's computer industry . 

In computer products , It is often a replication of a large number of the same modules , This is also IT The industry can develop very fast 、 The important reason why Moore's law can be established . 

Equivalence That is, any complex calculation can be equivalent to many addenda 、 reduce 、 ride 、 Division operation , Then it is equivalent to the logic of switching circuit , in other words , The latter is realized , The former is realized indirectly . 

I felt the difference at once , I just described the phenomenon , It doesn't touch the essence , There is no rule .

I asked myself ： The story of bull and Shannon , Can you think of this floor ？ 

It doesn't seem to work .

If it is purely technical , Such as redis When caching like this , I'll dig deep into the bottom ： There is a huge difference in speed between the various parts of the computer . But for the history of Technology , I can't do .

It can be seen that the scope of knowledge is not broad enough , Insight is not deep enough , Not up to this level .

Anyone can say a few words about superficial phenomena , But the profound things behind it are difficult to talk about , But it is precisely these things , We were impressed , Touch the heart .

I still have to read more in the future , Think more deeply , Try to discover the essence from the phenomenon , Sum up the regular things .

2

When writing about unit testing , I found Martin Fowler An article written , As soon as I saw the picture, I felt scratched . 

Figure shows the unit test , such as , You are testing Order class ,Order Class refers to Product and Customer, When doing unit tests , Do you want to use these two goods Mock Technology is isolated from testing ？ 

I used to encounter this situation when writing unit tests , It's hard to explain every time . 

Martin Fowler The power of the is that he has analyzed two situations , Each summed up an appropriate name ：

1.  Sociable Tests  

“ Socialization ” Test of , It means that everyone （Order, Product, Customer） All together , No segregation

2.  Solitary Tests

“ alone ” test , It means to separate , Only test Order class .

This really brightens my eyes , With a mutually agreed name , Communication efficiency is greatly improved , Just like design patterns , As long as you say you used observer mode , I know what it looks like without looking at the code . 

I have to reflect ： These two test methods have been entrenched in my mind for a long time , Why didn't I summarize , Give it an interesting , The appropriate name ？ 

The first is lack of consciousness , little does one think ; Secondly, I'm afraid my ability is not enough . 

Be able to say what others want to say , But something difficult to express , Successfully scratched everyone's itch , This is really a great skill .

3

Two small things , Let me feel a big gap with the great God . 

Want to keep going up , Knowledge needs to be broader , Insight must be stronger , Thinking must be deeper . 

It needs to be recorded frequently 、 Arrangement 、 reflection 、 Output , If we look at fragmented things all day , The brain is useless .

A passage , null . 

（ End ）

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