Javascript String Functions

The strings in Javascript are actually objects with a bunch of properties and functions that can be accessed .The javascript String object is used to manipulate a stored piece of text.

What’s a String Function

The string’s functions used to find out more about your string. For example, the string function search lets you search a string for a specified value that you supply.

It is important to note that these functions do not actually change the string itself, rather it returns a new string that you will have to store if you want to use it elsewhere.

What’s a String Property?

A property is just some basic information about the object. For example, a string object has a length property which stores the number of characters in the string.


String Methods and Properties

The following lessons will teach you how to manipulate, count, reorder, replace, search and do just about anything else to your Javascript strings. These advanced topics will open up a whole new world of choices for the dynamic web pages you have yet to build!

Method Description
anchor() Creates an HTML anchor
big() Displays a string in a big font
blink() Displays a blinking string
bold() Displays a string in bold
charAt() Returns the character at a specified position
charCodeAt() Returns the Unicode of the character at a specified position
concat() Joins two or more strings
fixed() Displays a string as teletype text
fontcolor() Displays a string in a specified color
fontsize() Displays a string in a specified size
fromCharCode() Takes the specified Unicode values and returns a string
indexOf() Returns the position of the first occurrence of a specified string value in a string
italics() Displays a string in italic
lastIndexOf() Returns the position of the last occurrence of a specified string value, searching backwards from the specified position in a string
link() Displays a string as a hyperlink
match() Searches for a specified value in a string
replace() Replaces some characters with some other characters in a string
search() Searches a string for a specified value
slice() Extracts a part of a string and returns the extracted part in a new string
small() Displays a string in a small font
split() Splits a string into an array of strings
strike() Displays a string with a strikethrough
sub() Displays a string as subscript
substr() Extracts a specified number of characters in a string, from a start index
substring() Extracts the characters in a string between two specified indices
sup() Displays a string as superscript
toLowerCase() Displays a string in lowercase letters
toUpperCase() Displays a string in uppercase letters
toSource() Represents the source code of an object
valueOf() Returns the primitive value of a String object

String Object Properties

Property Description
constructor A reference to the function that created the object
length Returns the number of characters in a string
prototype Allows you to add properties and methods to the object


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