A variable may include only the letters
$symbol, and the underscore (
No other characters such as spaces or punctuation are allowed in a variable name.
The first character of a variable name can be only
Names are case-sensitive.
COUNTare all different variables.
There is no set limit on variable name lengths.
And yes, you’re right, that is the
$ sign there in that list. It
may be the first character of a variable or
function name. Although I don’t recommend keeping the
$ signs, it means that you can port a lot of
greeting = "Hello there" warning = 'Be careful'
You may include a single quote within a double-quoted string or a double quote within a single-quoted string. But a quote of the same type must be escaped using the backslash character, like this:
greeting = "\"Hello there\" is a greeting" warning = '\'Be careful\' is a warning'
To read from a string variable, you can assign it to another one, like this:
newstring = oldstring
or you can use it in a function, like this:
status = "All systems are working" document.write(status)
Creating a numeric variable is as ...