String Manipulation

The string object makes it easier to handle strings.

The following methods and properties are available for strings:

Note: In the examples, we assume that a variable called My String has been assigned the value "Go Johnny, Go Go Go".

Object	Explanation
length	Returns the length of the string MyString.length would return 19
charAt(n)	Returns the character at the specified position in the string. MyString.charAt(3)  would return the character "J". Note:J is the fourth character in the string,  but since counting starts with 0 the fourth  character is referred to as number 3.
charCodeAt(n)	Returns the character code at the specified position in the string. MyString.charCodeAt(4)  would return the value 74. The reason is that J is character #74 in  the so called ISO-Latin-1 code set.
indexOf(string[,n])	Returns the first position of the substring. MyString.indexOf("Go")  would return 0. Note: If a substring is at the beginning of a  string the position is zero. If a substring is not present within a  string the value is -1.  MyString.indexOf("Go",3) would return 11.  Note:  The search for "Go" starts at the third  character, but the counting still starts at the first.  The first presence of Go (if presence before the third character is omitted) is at the 12th character. Since the first character is referred to as number zero the result is 11.
lastIndexOf(substring[,n])	Returns the last position of the substring. MyString.lastIndexOf("Go")  would return 17. Note: If a substring is at the beginning of a string the position is zero. The last position in a string is therefore one less than the length of the string. If a substring is not present within a string the value is -1.
fromCharCode(x[,y,z])	Constructs a string from the specified sequence of ISO-Latin-1 codeset values String.fromCharCode(74,75,76)  would return "JKL".
substring(x,y)	Returns the specified subset of the string, by specifying the start and end indexes MyString.substring(3,9)  would return "Johnny". Note:  The first character is number zero. x indicates the start of the substring.  y indicates the end of the substring.  Thus, y is NOT the number of characters to include, starting at character x.
toLowerCase()	Returns the string in all lowercase  MyString.toLowerCase()  would return "go johnny, go, go, go".
toUpperCase()	Returns the string in all uppercase MyString.toUpperCase()  would return "GO JOHNNY, GO, GO, GO".
split(separator[,n])	Splits a string into an array of strings by separating the string into substrings MyArrayOfS=MyString.split(", ") would result in the creation of an array: MyArrayOfStrings[0] would be "Go Johnny" MyArrayOfStrings[1]  would be "Go"  MyArrayOfStrings[2]  would be "Go"  MyArrayOfStrings[3]  would be "Go"  The number of elements in the array  is stored in MySplitString.length.
	MyArrayOfStrings=MyString.split(", ",2) would result in a different array: MyArrayOfStrings[0]  would be "Go Johnny" MyArrayOfStrings[1]  would be "Go" By entering a limit on the number of splits, we reduced the array to 2 entries.
slice(x,y)	Does exactly the same as sub string.
substr(x,y)	Returns a subset of a string.This is almost the same as substring. The difference is that, in substring you enter startindex and endindex,  while in substr you enter startindex and numbers of characters to include. substr(3,6)  would return "Johnny", which is the same as substring(3,9)
match	Compare variables. Use this syntax instead: if(varibel1==variabel2) {bla bla bla}
replace(/subtext/[gi])	Replaces substrings of a string. MyString.replace(/Go/, "Up")  would return "Up Johnny, Go, Go, Go". MyString.replace(/Go/g, "Up")  would return "Up Johnny, Up, Up, Up". /Go/g forces a global replace. Not just replacing of the first "Go".  MyString.replace(/go/gi, "Up")  would return "Up Johnny, Up, Up, Up".  /go/i forces the replace to ignore upper and lower case differences.
search	Searches for substrings in a string. Use substring instead.

Examples :

1.Length of a String:

2. CharAt(n):

3.CharCodeAt():

4. IndexOf(string[,n]:

5. LastIndexOf(substring[,n]):

6. Concat Method:

7. LocaleCompare() Method:

8. Match() Method:

9. Replace() Method:

10. Search() Method:

11. Slice() Method:

12. Split() Method:

13. Substr() Method:

14. Sub string() Method:

15.  ToLocaleLowerCase() Method:

16. ToLocaleUpperCase( ) Method: