The Charat,indexof in JS

CharAt method

Returns the character at the specified index position.

Strobj.charat (Index)
Parameters

Strobj

Required option. Any String object or literal.

Index

Required option. The zero-based index of the desired character. A valid value is a value between 0 and the length of the string minus 1.
Description

The Charat method returns a character value that is at the specified index position. The first character in the string has an index of 0, the second index is 1, and so on. An index value that exceeds the valid range returns an empty string.
Example

The following example illustrates the use of the CharAt method:
function Charattest (n) {
var str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; Initializes the variable.
VARs A reputation variable.
S =str.charat (n-1); From the location indexed to n–1
Gets the correct character.
return (s); Returns the character.
}

-----------------------------Gorgeous split-line-----------------------------

IndexOf method
Returns the character position of a substring within a string object for the first time.

Strobj.indexof (substring[, StartIndex])

Parameters
Strobj

Required option. A String object or literal.

SubString

Required option. The substring to find in the string object.

Starindex

Options are available. The integer value that indicates the index at which to start the lookup within a string object. If omitted, it is searched from the beginning of the string.

Description
The IndexOf method returns an integer value that indicates the starting position of the substring in the string object. If no substring is found, 1 is returned.

If the startindex is negative, then startindex is treated as zero. If it is larger than the maximum character position index, it is treated as the largest possible index.

Performs a lookup from left to right. Otherwise, the method is the same as LastIndexOf.

Example
The following example illustrates the use of the IndexOf method.

function Indexdemo (str2) {

var str1 = "Babebibobubabebibobu"
var s =str1.indexof (STR2);
return (s);
}

The Charat,indexof in JS