[go record] start go language from scratch -- make an oscilloscope with go language (I) go language foundation

I participated in a challenge today , Starting from scratch GO Language , For a week GO Language development of a serial port oscilloscope .

I haven't been in contact with GO Language , It's just C/C++, Learn from scratch GO, expect 8 Fast hours .
Use this for learning videos ： Learning video

GO Language benefits ： Simple and easy to use .
Dachang road , Yes C The foundation is easy to take off .
The goal is

GO grammar ：
GO Language variables

Be similar to C Enumeration of languages ：

Returns two values ：



init and import Guide pack

Be similar to include, stay GO It's called guide bag

Basic pointer （ Did you learn C You can skip ）

defer（ No define）
Finally execute in the form of stack .（ It is roughly to set a stack in the function , Execute first, press in first , After the function runs , Out of the stack , The first is the last ）
Follow the principle of "first in, second out" .



return The following statement is executed first .defer Finally, execute .

for loop ：

len Calculate the length of the array ：

The array length should match

// What is passed is reference passing , It's a pointer （ Similar to array name , The type is int[]）

slice Four methods of ：

%v Is to print out variables variable It means , Joint output [].

Four statements slice The way ：
by make() add to

slice Slice addition and interception ：
Capacity and length are different ,

The length is indeed 3, But capacity is an illegal pointer ptr Values outside （ from make The third parameter determines ）, Want to operate the first one behind , Have to use append( Slice name [],2) It means appending a value to the slice name , by 2,

Reuse append( Slice name [],3) It can be added as the data of the fifth capacity , When it comes to the fifth or more , Reuse append( Slice name [],2) You can open up the length and capacity , The development size is the previous cap The capacity of （ Opened up at one time 5 individual , In an inch of land, an inch of gold flash Don't like to play like this ）

copy function ：

map Three declaration definitions of ：

Now this is an empty map（==nil（ Equivalent to NULL））

map usage ：