Loop

Question

Hello i havé several questions on loop:

-There are several ways to write loops, which is the best ?

-In the loop 1 what can I put in place of i++, they say we can put i—or something else, but it doesn’t give a result...

-In the loop 4 what i can put in text or in the place of text and what is it used for ?
https://code.sololearn.com/WzgZkRgEvE5a/?ref=app
https://code.sololearn.com/WvRBpyYtYfML/?ref=app
https://code.sololearn.com/Wf3GvteUPheb/?ref=app
https://code.sololearn.com/WdtvMiwB47Bf/?ref=app
Thank’s

Answer 1

The For Loop
It’s the most basic of loops in JavaScript and is quite versatile.

for (i = 0; i < 10; i++) {
// do something
}

Our for loop consists of three statements, one that is executed before our loop starts ( i = 0 ), one that defines how long our loop should run ( i < 10 ), and one that is executed after each loop ( i++ ).

In this example, we are setting i = 0 before our loop starts. We will continue to loop as long as i < 10, and each iteration of the loop will increase i by one. Finally, within our brackets is the code that will be run on each iteration of the loop.

Answer 2

Skipping parts! ;)

Any part of 'for' can be skipped.

For example, we can omit 'begin' if we don’t need to do anything at the loop start.

let i = 0; // we have i already declared and assigned

for ( ; i < 3; i++) { // no need for "begin"
alert( i ); // 0, 1, 2
}

We can also remove the 'step' part:

let i = 0;

for ( ; i < 3; ) {
alert( i++ );
}

The loop became identical to while (i < 3).

We can actually remove everything, thus creating an infinite loop:

for ( ; ; ) {
// repeats without limits
}

Please note that the two 'for' semicolons ; must be present, otherwise it would be a syntax error.

Answer 3

Axelle
In fact, they are all the same!👍
You can use 'for' loop in a different ways or combine them!

Answer 4

Axelle 👍😉
You are welcome! 😊
I'm glad it helped! 😆

Answer 5

ok thanks
so i haven't need of the other version ..?!

Answer 6

thank you very much
it’s much clearer with you 😅😇