for loop starts with the
for keyword which is followed by a set of parentheses with three statements inside that tells the loop how many times it should repeat.
for (var count = 1; count < 5; count += 1)
The first statement
var count = 1 creates a variable named count and assigns it an initial value of 1.
This is the starting point for the number of times the loop repeats.
The next statement
count < 5 tells the loop when to stop running, in our case then count is less than 5 which means that the loop will repeat four times.
The last statement
count += 1 determines the rate at which the variable is changed and whether it gets larger or smaller each time.
The code you want the loop to execute has to be enclosed within curly brackets.
If the third statement will be changed to
count += 3 for example, the loop will run only twice since first time the value of
count is 1 then the second time the value will be 4 and the third time it will be 7 which is not less than 5.
You can create some kind of list style using the fact that the variable is going up by 1 each time.
Loops can be nested within other loops. Of course you can nest as many levels deep as you can handle.
You can nest different types of block inside one another. For example you can nest an
if/else statement inside a