In Javascript string object is used to hold a series of charecters and allows you to perform string manipulations, such as finding character index, replacing charecter, converting string in uppercase ot lowercase etc.
A Javascript can be any text inside double or single quotes and support variety of helper methods to manipulate on it.
Syntax
OR, you can use String global object directly
JavaScript distinguishes between String objects and primitive string values. JavaScript automatically converts primitives value to String objects, so that it's allows you to use String object methods for primitive strings as well.
In Javascript string primitives and string objects also give different results when you use eval(). Primitives passed to eval are treated as source code; String objects are treated as all other objects are, by returning the object. For example:
Sciens JavaScript treats primitive values as objects when executing methods and properties it supports all methods and properties are accessible to primitive type as well.
Here is a list of each property and their description.
Property | Description |
---|---|
constructor | Returns a reference to the String function that created the object. |
length | Returns the length of the string. |
prototype | The prototype property allows you to add properties and methods to an object. |
Here is a list of string methods which is used to manipulate string object.
Method | Description |
---|---|
charAt() | Returns the character at the specified index. |
charCodeAt() | Returns a number indicating the Unicode value of the character at the given index. |
concat() | Combines the text of two strings and returns a new string. |
indexOf() | Returns the index within the calling String object of the first occurrence of the specified value, or -1 if not found. |
lastIndexOf() | Returns the index within the calling String object of the last occurrence of the specified value, or -1 if not found. |
localeCompare() | Returns a number indicating whether a reference string comes before or after or is the same as the given string in sort order. |
match() | Used to match a regular expression against a string. |
replace() | Used to find a match between a regular expression and a string, and to replace the matched substring with a new substring. |
search() | Executes the search for a match between a regular expression and a specified string. |
slice() | Extracts a section of a string and returns a new string. |
split() | Splits a String object into an array of strings by separating the string into substrings. |
substr() | Returns the characters in a string beginning at the specified location through the specified number of characters. |
substring() | Returns the characters in a string between two indexes into the string. |
toLocaleLowerCase() | The characters within a string are converted to lower case while respecting the current locale. |
toLocaleUpperCase() | The characters within a string are converted to upper case while respecting the current locale. |
toLowerCase() | Returns the calling string value converted to lower case. |
toString() | Returns a string representing the specified object. |
toUpperCase() | Returns the calling string value converted to uppercase. |
valueOf() | Returns the primitive value of the specified object. |
trim() | Removes whitespace from both ends of a string. |
Here is a list of each method which returns a copy of the string wrapped inside the appropriate HTML tag.
Method | Description |
---|---|
anchor() | Creates an HTML anchor that is used as a hypertext target. |
big() | Creates a string to be displayed in a big font as if it were in a <big> tag. |
blink() | Creates a string to blink as if it were in a <blink> tag. |
bold() | Creates a string to be displayed as bold as if it were in a <b> tag. |
fixed() | Causes a string to be displayed in fixed-pitch font as if it were in a <tt> tag |
fontcolor() | Causes a string to be displayed in the specified color as if it were in a <font color="color"> tag. |
fontsize() | Causes a string to be displayed in the specified font size as if it were in a <font size="size"> tag. |
italics() | Causes a string to be italic, as if it were in an <i> tag. |
link() | Creates an HTML hypertext link that requests another URL. |
small() | Causes a string to be displayed in a small font, as if it were in a <small> tag. |
strike() | Causes a string to be displayed as struck-out text, as if it were in a <strike> tag. |
sub() | Causes a string to be displayed as a subscript, as if it were in a <sub> tag |
sup() | Causes a string to be displayed as a superscript, as if it were in a <sup> tag |