> For the complete documentation index, see [llms.txt](https://eleven-fifty-academy.gitbook.io/javascript-101-fundamentals/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://eleven-fifty-academy.gitbook.io/javascript-101-fundamentals/1-javascript-fundamentals/1-js-fundamentals/3-loops/while-loops.md).

# While Loops

## While Statement Loops

It is possible for a `while` loop to stand without the `do`. Including the `do` guarantees that the statement inside the `while` will process once. It is wise to take care with stand-alone `while` loops, as they have a natural tendency to go infinite.

The `while` loop executes its statements if the designated condition (i.e. `n < 3`) reads as TRUE. If the condition reads FALSE, the statement within the loop stops executing and control passes on.\
&#x20;The condition is checked before the statement (i.e. `n++; x += n;`) is executed, at which point, the condition is checked again.\
&#x20;If the condition returns FALSE, execution stops and control passes on before the statement is executed.\
&#x20;To execute multiple statements, use a block statement (`{...}`) to group.

```javascript
//While Loops

//Create a variable
var score = 0;
        //Set a condition in parens
while(score < 10){
    //Set an increment operation
    score++;
    //Print to the console
    console.log("Score: ", score);
}

//Another example
var age = 0;
while(age < 100){
    age+=10;
    console.log("Age:", age);
}

if (age === 100){
    console.log("I made it!");
}

//A challenge -create a while loop that prints 10-100 by 10s. AT 50
// print "Halfway there!"

var counter = 0;
while(counter < 100){
    counter+=10;
    if(counter === 50){
        console.log("There's halfway");
    } else {
        console.log(counter);
    }
}
```

## Difference Between For and While Loops

```javascript
// for loop

var cars = ['BMW', 'Volvo', 'Saab', 'Ford'];
var i = 0;
var text = '';

for (;cars[i];) {
  text += cars[i] + '<br>';
  i++;
}

// while loop

var cars = ['BMW', 'Volvo', 'Saab', 'Ford'];
var i = 0;
var text = '';

while (cars[i]) {
  text += cars[i] + '<br>';
  i++;
}
```


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