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JavaScript

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let's look at we also have

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while cycles, food Vile,

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how they differ in that the file is a so-

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called cycle with a precondition while with a

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postcondition, and

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just like the fore inside,

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we can specify an

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expression that will be calculated and

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here let's say and less than 10 means

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that you need to execute a block of operators

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that, after the file, should be executed

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while a is less than ten, as soon as a is

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greater than or equal to 10, you need to

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urgently exit this loop. In this

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example code, we have the beginning of a equal to zero,

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then at the first iteration, a plus plus

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increases

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a by one and then again the control

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goes to the beginning of this cycle, we

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compare and it is already equal to one, one is

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still less than 10,

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this means that we need to execute the

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lacquer console again and now here it is

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already equal to two and this

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piece of code will actually give us all the

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values from zero to nine like this and here’s

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an example let’s la which also displays the

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same column from the value from 0 to 9

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only here we

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moved the condition to the end of the loop and

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then wrote a block of operators and at

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the end of the vile that is, execute this block

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while the

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value is inside, or

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rather the expression inside the file there will be a corpse

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and here we execute

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comparing at the beginning of the loop and here comparing

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at the end of the loop that is,

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in fact,

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but in this case it will be approximately

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the same and will output the same to us, but we

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sometimes want

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to compare before the block of operators, sometimes

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after the block of operators,

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so let's now try

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what do we need to do to

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pause work in the middle of the cycle?

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Here we have a cycle file and

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here we go through the same process from

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zero to ten to 9 until it

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is less than ten,

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increase it and by one then print the

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line hallow and print the

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number that we have

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inside oh there is an example

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of the output here, and

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now we also have them inside, we will put them

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here we compare in efi if i is 5 in

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this case we want to exit the current iteration

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but continue further and calibrate

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that is, we want the control and the

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lines in which written conti new

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again returned to the beginning at the beginning of

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this cycle and the

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execution was repeated, well, at the next

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iteration we already have since it

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has increased by one and will already be

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equal to 6, so continue will not be executed and

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so we can follow the output here

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we have hello 1 world hello 2 and

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so it came to hello 5 but after

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hello 5 world it didn’t become clear why this

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happened because conti new threw

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us to execute the loop from the beginning and the line

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console legs world did not execute well and

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then we exited the loop when and

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became equal to 10 we went out and

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basically wrote the console log

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and in this way,

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so

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let’s also see that we have

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break, from the previous example we

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replaced continue with break, and in this

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case, as soon as ours became equal to

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five, we did not switch to execution here,

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but just immediately left this cycle, that

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is, here as soon as Hello 5, that’s all

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at once and we can leave the cycle, well,

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usually this is done according to some condition, of

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course, in the same way, conti new and

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break will work until for the for

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of and for in loops which we did last time

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saw that is, we can use

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continue and break in cycles of Vile duvall

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for four of and for and that is, in all

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cycles we

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break and continue

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can

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now apply some real application,

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let's say we have a sum function and we

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pass some kind of the number

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of arguments, well, we don’t know in advance

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how many were passed here again, this is

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the number one two three four five could 10

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pass could 100 pass we

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don’t know in advance how many arguments we

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will pass there and we want to write a function

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in such a way that we firstly have all the

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arguments which come here ended up in the

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arks array and then we go through these

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arguments until they run out and as

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soon as they run out we put them all in

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and in general this way we

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calculated the sum, well, we don’t

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understand everything in this function yet, but

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let’s look at it line by line due to the rest

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here we have the

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rest operator which we have already seen

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further, I will pour a variable at the beginning of

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my functions and update it as they say, in general

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we assign 0 there, then we go in a loop

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until the

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arguments, well, the length of the array is greater than zero

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until

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we haven’t looked at arrays yet, haven’t studied them, but

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I’ll tell you in advance I will say that arks. dad,

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in general, takes

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one value from the array and

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in the array it naturally becomes one

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less value and we took it from the

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array, added up our values in the array, it became

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one less value and

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we have arcs in the pursuing pass in the loop. lance is less

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by one and at some point there will be

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nothing left there

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as soon as there is nothing left here we will

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exit this cycle and immediately return what we have

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accumulated in value because we

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have been adding the value from

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this array all the time

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were formed as a goal, that is, we

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will calculate the sum here, so this is the

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sum function that is more universal than the

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one we wrote with two numbers up

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in the previous example,

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well, we can also rewrite this

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same function with a dual, well, you

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can also trace it here Well, here we’ll also

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add a

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comparison of the length of the array to 0, if there’s

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nothing in the array there and immediately return 0,

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we can optimize and

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then

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declare the variable again in the loop,

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take the next value from the array

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again, reach the end of the array and

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give it the target, you can write it like this

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So, in general, the sum function can be

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written in probably

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countless ways, and later we

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will see much

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better ways of how to add all the numbers from

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an array, and here is

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another such example, this is the slip function,

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here we also don’t know everything, we don’t

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know what

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Newgate does but we will assume that this is the

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whole line, this whole function on y, it

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simply returns the value of number, the

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current time represented in a

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value of type number and

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now we call we will use the

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function on y, we will use it

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inside the slip function, but by name we

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can have several call it once and

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in fact, this is

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like a function that allows us not to

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write the same thing twice,

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here we

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actually have this on y

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calculated twice, we could generally have the

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same value just write newgate in both places

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.

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bedtime and here and here write well, in

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fact, the java script will most likely be

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optimized and substitute this

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expression

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in instead of calling functions, this is called

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yang lining but you don’t

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actually need what will happen here on

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y will return the current time and we

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we want to

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spin this drain, spin the loop until a

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certain interval passes,

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this interval in milliseconds is

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passed to the slip function, we call it on

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y and

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add it with the interval, that is, here we

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add the number of milliseconds at the current moment with here we have five thousand with

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five thousand, the current time plus 5000

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milliseconds and now we rotate the loop until

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our function on y returns a value

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less than the end, we immediately calculated

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what time should be at the end of

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our wait for this loop

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and

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wait until the function on y begins

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to return and that’s each once we have a

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wile, the function on is called again

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and it returns the current time there again,

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it is still less than the end, which

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means again

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wild once again executes this cycle, because

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here we have this example, I specifically brought this example here

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because here we have a cycle without a

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body it will simply fulfill the same condition all the time,

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but there is no block of

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operators at all,

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but it will constantly call the function

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on y until it becomes

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equal to or greater than ind and as soon as this

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happens we will exit the slip functions in this

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way when we write slide 5 thousand y

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we

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can no longer execute anything in the program

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and we will wait 5 seconds for at

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least five seconds

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until we exit this function like

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this, you can also use the wild loop

Description:

Патреон: https://www.patreon.com/tshemsedinov Github автора: https://github.com/tshemsedinov Группа в телеграме: https://t.me/metaedu

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