4. Index of:
The index of is take string method and return the first occurrence of the given specified value.
5 . Replace :
The replace method like a faction and also take tow parameter the first parameter indicates which is replace and the second parameter is value and replace by this value.
toUpperCase is a very simple method of string. toUpperCase converted to upper case according to any locale-specific case mappings. see the example below.
toLowerCase convert any string upper case to lower case. see the example below.
Slice is an interesting method, slice method takes two parameters the first parameter value starting point to slice and the second parameter value end of the slice. slice take parameter as a number and take a position by indexOf. slice return string. if you confused see the example below.
9. Split :
The split method takes a parameter and divided all string by parameter velu and returned array. see expel for easy to understand.
parseIntr() convert string to intger number .parseint return number.
next part coming soon