November 8, 2023
String.raw() method, which is often used in regular expressions and file paths.
String.raw() method returns a string where escape characters (like
\\n for a new line) are ignored and treated as literal text. This is particularly useful when dealing with strings that include file paths or regular expressions where backslashes are prevalent.
The syntax for
String.raw() is straightforward:
callSite: Typically a template literal containing the desired string.
substitutions: Values to be interpolated within the template literal.
String.raw() with template literals
Template literals are enclosed by the backtick ( ``) characters instead of single or double quotes, allowing embedded expressions called substitutions.
String.raw() treats backslashes as literal characters, it’s important to note that it will not escape other characters unless a double backslash is used.
You can use substitutions to insert values into the string:
String.raw() as a tag function
String.raw() can also be used as a tag function for a template literal. In this context, it acts as a function that processes the template literal.
In the above example,
\\n is not interpreted as a newline character but as a backslash followed by the letter 'n'.
Handling strings without substitutions or outside template literals:
String.raw() is called with an object that has a
raw property, demonstrating its flexibility.
Common use cases
String.raw() is commonly used in situations where escape sequences are problematic:
- File system paths on Windows.
- Regular expressions where backslashes are necessary.
- When generating strings for other programming languages or command-line utilities.
How to use the raw value of a string
To use the raw value of a string, essentially bypassing escape sequences, you can pass a template literal directly to
This method ensures that the string is interpreted exactly as it's written, without processing escape sequences such as
\\n for new line or
\\t for tab.
Tips and best practices
- Always use
String.raw()with template literals for consistent behavior.
- Remember that
String.raw()does not escape single or double quotes.
- Utilize substitutions to simplify dynamic string generation.
String.raw()judiciously to improve code readability when dealing with escape sequences.
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