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Уроки JavaScript | #11 - Объекты

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00:00:01

hello everyone, look they sound tough

00:00:07

today we will talk about functions but they are

00:00:09

sleeping subscribe our channel like

00:00:12

this video and write a comment

00:00:14

also subscribe to our

00:00:16

VKontakte group like write

00:00:19

comments participate in discussions

00:00:23

what let's talk often we need

00:00:27

to repeat the same action in

00:00:30

many parts of programs,

00:00:31

for example, it is beautiful to display messages when

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greeting a visitor, as well as when a

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site visitor exits, perhaps

00:00:40

in order not to repeat the same code; in

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many places, examples of

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built-in functions and kanfer have been invented,

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and you can also create your own

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declare a function, let's look at the

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example of the

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word noise noise the name for our function

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here we indicate the parameters for our

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function but you can also not specify it

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and here we will display let's say the message 5

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first comes the

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legs of the evening better after it the name of the

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function then a list of parameters in brackets

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and the body of the function the code that is

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executed when calling the function for

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in order to call this function, we

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need to write down

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the name of our function,

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this code will display a message twice,

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as if here already and you can see the main goal of

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creating functions is to

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get rid of code duplication, if

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you need to change messages or also

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ways of displaying it, just change

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it in one place of the function that it comes

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out let's see hello everyone hello

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everyone but these let's talk about local

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variables and can keep

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local variables declared and through

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war such variables are visible only inside the

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function that is, if we all here

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declare the message variable and assign

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values

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hello this will be a local

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variable no we see our message in

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this way, a

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new view, if you want to do it

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like this and display

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this message you will receive you will not

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get anything fact error

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it is important where exactly the function is how many times the

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variable is any declaration is

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triggered once and 1 percent

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applies to the entire function

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also let's talk about external variables

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a function can access an external

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variable for example if we create let's

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call bold let's say alex

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if we want

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john and

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carry out assign it external change

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next

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print hello let's say I and print our

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grains then just print this

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message

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further mutually our function

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as you can see hello I John, of course, if

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inside the function,

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yes, on the line, its own

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local variable war was declared, all

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calls would use it and external

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changes would remain unchanged;

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variables declared at the level of the entire

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script are called global variables,

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that is, it’s bolder that we

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make a global variable and only

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those variables that are global really

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have a general meaning

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for your project needed to solve a

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specific problem let them be local

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in the corresponding function I would also like to

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talk about choosing a name for a function not a

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function follows the same rules as a

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variable name the main difference is it

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must be a verb

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that is, a function is an action the rule

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is used here is a verbal prefix

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denoting the general nature of the action,

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followed by a clarification of the functions

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that begin with show

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something shows that you think, let's say

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functions starting with get how

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calculate glue create people I

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check I think that in principle everything is simple

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and it is very convenient since it is

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shifted to the function of men approximately Let

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's imagine what it does even if

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the function was written by seven people, identified

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cases and what type of value it

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returns,

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let's do it so that there is one

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function,

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one action, the function should

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only do what its name clearly plays out

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and this should be but is

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if it is complex and imitates the action

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maybe it makes sense to isolate their

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separate functions, what does it make sense to

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structure better under also,

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let's talk about returning a value, a

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function can return a result

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that will be passed to the callers and the code,

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for example, let's create a function that will

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return the discriminant of a quadratic

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equation squared minus 4 GHz

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here is my why BMP and nose

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40 with it a variable test which we will write down

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the value 41 by translating our variable

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test

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we will get our those 20 hurry just to

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return the value our directive is used

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and it can be located

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anywhere in the function only before it finds

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control the function is completed and the

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value is passed back to the call

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because it can be, for example, several

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region directives, it can also be

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used without a designation to

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stop execution and exit our

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function, in principle, that's all I wanted to

00:10:28

tell everyone, thanks for watching, see

00:10:31

you again

Description:

Уроки JavaScript | #10 - Функции В этом уроке поговорим о создании функции и их причастности к Javascript. Разберем как они используются в последующих шагах в программе. Официальная группа Вконтакте: https://vk.com/developblog

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