Get the number of characters in the text string.

let text = "";
text.length;

• a number that is the length (number of characters) in the text string.

Add some text to a string until it is at least 100 characters long.

let tooShort = "";
while (tooShort.length < 100)
{
    tooShort = tooShort + "add some more...";
}