JavaScript String

February 8, 2021 10:45 am IST

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JavaScript String

Strings are another basic data type available in JavaScript.

They consist of zero or more characters delimited by quotes, either single quotes or double quotes. However, the string must end with the same quote mark it started with. For example, 'Hello' (valid), "Hello" (valid), "Hello' (invalid).

Note: There is no rule for which type of quote to use.

In the following example, we will display the string "Hello" using document.write() method.

Example

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<!DOCTYPE html> <html> <body> <script> var str = "Hello"; document.write(str); </script> </body> </html>

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Concatenate Two Strings

Use "+" operator to concatenate two strings.

Example

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<!DOCTYPE html> <html> <body> <script> var str1 ="Hello"; var str2 ="World"; document.write(str1 +" "+ str2); </script> </body> </html>

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Quote a String

To Quote a string in the middle. Do any one of the following

Use Escapse Sequence (\') to quote a string.
Enclose a string with double quotes to single quote a string in the middle.
Enclose a string with single quotes to double quote a string in the middle.

Example

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<!DOCTYPE html> <html> <body> <script> var str ='she\'s is pretty'; document.write(str); // or simply var str = "she's is pretty"; document.write("<br>" +str); </script> </body> </html>

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Create a String using Object

Use new String() function to create an object string.

Example

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<!DOCTYPE html> <html> <body> <script> var str1 ="One"; var str2 =new String("Two"); document.write("str1 : " +typeof str1); document.write("<br>str2 : " +typeof str2); </script> </body> </html>

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