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Java Script Include a Backslash Character in a String

In Java Script strings, escape sequences are used to inform the interpreter that a character is not just a letter, but that special action should be taken. For example the escape sequence \n indicates that the string should continue on a new line. A backslash indicates the next character is part of an escape sequence.

But what if you actually want to include a backslash in a string, not to start an escape sequence, but to just be displayed as a backslash? To print an actual backslash, you have to escape the backslash with a backslash, as shown below.

var aStr = "To include a backslash in a string, escape it with a \\";

In this case, the backslash would be displayed because it's actually part of an instruction to the interpreter to display a backslash.

In the example below, the programmer's intent was to display a message informing the user that the file was copied to the \networking folder.

alert("File copied to the \networking folder");

Where the heck is the etworking folder?

Instead, it informs the user that the file was copied to the etworking folder. Where the heck is the etworking folder? The error is caused because the \n in \networking is interpreted as an escape character instructing the interpreter to continue on a new line.

In the example below, the backslash was properly escaped.

alert("File copied to the \\networking folder");

The backslash was properly escaped

More Java Script Code:
• Define Lines in a String
• Accessing Web Page Elements
• The continue Statement
• JavaScript Operators
• Java Script Number Object
• JavaScript .big and .small to Change Text Size
• Using the Java Script eval() Function
• Convert a String to a Number
• Window Object Properties and Methods
• JavaScript Character Escape Sequences

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