JavaScript Basic: While Loops

According to the course, loops refer to DRY (Don't Repeat Yourself). In the other word, we want to keep our code as DRY as possible. Loops offer a easy way to run the code repeatedly and save us a lot time.

While Loops

While loops is one kind of loops. It allows to repeat code While a condition is true.

while(someCondition) {
//run some code
}

While loops is very similar to an if statement, except it repeats a given code block instead of just running it once.

For example:

var num = 1;
while(num <= 10) {
          console.log(num);
          num += 2;
}

The example assumes a number is equal to 1 and gives a condition we run the (num +2) and count how many result are less and equal than 10.

When I run the loop in the console, the result:

The (num + 2) result less than 10 are 1, 3, 5, 7, 9. And it ends by 11 since 11 is greater than 10.

Infinite loops occur when the terminating condition in a loop is never true.

For example: var count = 0
                      while(count < 10) {console.log(count);}

This example prints "0" over and over because count is never incremented.