javascript

Chapter 3: Language Basics
Character Literals
The String data type includes several character literals to represent nonprintable or otherwise useful
characters, as listed in the following table:
Literal
Meaning
\n New line
\t Tab
\b Backspace
\r Carriage return
\f Form feed
\\ Backslash (\)
\’ Single quote (‘) — used when the string is delineated by single quotes.
Example: ‘ He said, \’hey.\’’.
\” Double quote (“) – used when the string is delineated by double quotes.
Example: “ He said, \”hey.\””.
\xnn
\unnnn
A character represented by hexadecimal code nn (where n is an octal digit 0 - F).
Example: \x41 is equivalent to “A”.
A Unicode character represented by the hexadecimal code nnnn (where n is a
hexadecimal digit 0 - F). Example: \u03a3 is equivalent to the Greek character .
These character literals can be included anywhere with a string and will be interpreted as if they were a
single character, as shown here:
var text = “This is the letter sigma: \u03a3.”;
In this example, the variable text is 28 characters long even though the escape sequence is six characters
long. The entire escape sequence represents a single character, so it is counted as such.
The length of any string can be returned by using the length property as follows:
alert(text.length); //outputs 28
This property returns the number of 16 - bit characters in the string. If a string contains double - byte
characters, the length property may not accurately return the number of characters in the string.
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