1
00:00:14,450 --> 00:00:19,290
Hello and welcome to the goal and programming language course in this session.

2
00:00:19,310 --> 00:00:22,310
We want to talk about the fonctions concept.

3
00:00:26,180 --> 00:00:28,040
Functions and go land.

4
00:00:30,110 --> 00:00:38,450
A function is a group of statements that exist within the program for the purpose of performing a specific

5
00:00:38,450 --> 00:00:46,340
task and return or reason to the caller, a function can also perform some specific tasks without returning

6
00:00:46,340 --> 00:00:46,900
anything.

7
00:00:48,200 --> 00:00:57,530
Every GO program has at least one function, which is mean you can divide your code into separate functions.

8
00:00:58,040 --> 00:01:02,390
How you divide your code among different functions is up to you.

9
00:01:02,840 --> 00:01:09,560
But logically, the division should be such that each function performs a specific task.

10
00:01:10,970 --> 00:01:14,690
Functions can make your application modular.

11
00:01:15,380 --> 00:01:24,110
Go Lang supports functions that goes beyond our library, provides no built in functions that your program

12
00:01:24,110 --> 00:01:24,950
can con.

13
00:01:25,340 --> 00:01:32,420
For example, the function LEN takes arguements of various types and returns the length of the time.

14
00:01:36,790 --> 00:01:38,380
Function declaration.

15
00:01:39,900 --> 00:01:46,800
A declaration begins with the foreign keyboard, followed by the name you want the function to have

16
00:01:47,100 --> 00:01:52,050
it paid off parenthesis and then a block containing the functions code.

17
00:01:54,050 --> 00:01:59,480
The declaration of the functions contains font function name.

18
00:02:01,080 --> 00:02:02,070
Parameters.

19
00:02:04,200 --> 00:02:05,310
Return tide.

20
00:02:06,670 --> 00:02:07,810
Function by the.

21
00:02:10,550 --> 00:02:17,420
Found that it is sourced the declaration of the function function name.

22
00:02:18,650 --> 00:02:25,130
It's the actual name of the function, the function name and the time list released together constitute

23
00:02:25,130 --> 00:02:26,510
the function signature.

24
00:02:28,300 --> 00:02:34,930
Parameters, a parameter is like a placeholder, then the function is invoked.

25
00:02:35,140 --> 00:02:37,480
You pass a value to the parameter.

26
00:02:37,810 --> 00:02:41,680
This value is referred to as actual parameter or argument.

27
00:02:42,370 --> 00:02:48,490
The parameter least refers to the time, order and number of the parameters of the function.

28
00:02:49,300 --> 00:02:51,070
Parameters are optional.

29
00:02:51,370 --> 00:02:54,550
That is, the function may contain no parameters.

30
00:02:54,790 --> 00:03:02,920
Return type If function may return a list of values, the return times is the least of data times of

31
00:03:02,920 --> 00:03:05,020
the values the function returns.

32
00:03:05,560 --> 00:03:12,280
Some functions perform the desired operations without returning a value function body.

33
00:03:12,850 --> 00:03:17,850
It contains a collection of statements that define what the function does.

34
00:03:22,820 --> 00:03:24,530
Points to remember.

35
00:03:25,870 --> 00:03:32,440
And they must begin with the letter and can have any number of additional letters and numbers.

36
00:03:33,630 --> 00:03:36,510
A functioning cannot start with a no.

37
00:03:37,810 --> 00:03:46,180
A function named cannot contain spaces if the functions with the names that are solved with an uppercase

38
00:03:46,180 --> 00:03:49,150
letter will be exported to other packages.

39
00:03:49,570 --> 00:03:56,020
If the function name is sourced with a lowercase letter, it won't be exported to other packages, but

40
00:03:56,050 --> 00:03:59,320
you can call this function within the same package.

41
00:04:00,340 --> 00:04:08,260
If a name consists of multiple wars, each war after the first should be capitalized like this display

42
00:04:08,260 --> 00:04:11,770
name and print entries, and et cetera.

43
00:04:13,090 --> 00:04:15,700
Function names are case sensitive.

44
00:04:16,120 --> 00:04:25,360
For example, print pained by the first uppercase and print by the old letters of her case are three

45
00:04:25,360 --> 00:04:30,610
different variables in order not to prolong the time of decision.

46
00:04:30,760 --> 00:04:34,870
You will finish sheet and we will continue the content in the next session.

47
00:04:35,200 --> 00:04:35,800
Goodbye.