String Functions in Javascript,String Functions,Java script String Functions

String functions:

These functions will work only on strings.

Length: It written the length of the string.

Syntax: string name.length

toUpperCase: convert the string into upper case.

Syntax: string name.toUpperCase

toLowerCase: convert the string into lower case

syntax: string name.toLowerCase

indexOf: It written the index or position of a character.

Syntax: string name.indexOf(character,string index)

NOTE: if character not found it written -1.

lastIndexOf: It written the position of character from last occurrence.

Syntax: string name.lastIndexOf(character,string index)

Example:

var str=”this is sample string”;

document.write(str.lenght)

CharAt: It written CharAt specified Index.

Syntax: string name.CharAt(Index)

Example: document.write(str.CharAt(2));

CharcodeAt: It returns array number of character at specified index.

Syntax: document.write(str.CharCodeAt(8));

ConCat: It is used to combain 2 or more strings.

Syntax: string name.ConCat(string2,string3)

Example:

var str2=”test”;

var str3=”test1”;

document.write(str2.ConCat(str,str3));

Match: It is used to search a value in specified string, if value found it written values, when value not found it written null.

Syntax: string name.Match(value)

Example: document.write(str.match(‘is’));

Search: It is also used to search a character or word or value, if character found it returns index of the character, when character not found, it written -1.

Syntax: string name.search of value

Example: document.write(str.search(‘is’));

Replace:  It is used to replace old string into new string in specified string, But it replace only one occurrence.

Syntax: string name.replace(old string,new string)

Example: document.write(str.replace(‘is’,’test’));

Substring: it is used to get sub string from main string.

Syntax: string name.substring(starting index,ending index)

Example: document.write(str.substring(10,16));

SubStr: It is also similar to substring function.

Syntax: string name.substr(starting index,number of char)

Example: document.write(str.substr(10,6));

Srtingname.big: applying big tag to string

Example: document.write(str.big()+”<br>”);

Stringname.small: Applying small tag to  string.

Example: document.write(str.small()+”<br>”);

String.blod: Applying bold tag to string.

Example: document.write(str.bold()+”<br>”);

String.italic: Applying italic tag to string.

Example: document.write(str.italic()+”<br>”);