String Functions:

1) String length: To count the string length.

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2) String Index: It represents the position of element in the string starting from 0 to length-1.
The IndexOf() returns position of first occurrence of specified sub string in the string.
The charAt() returns the character at specified index of string.

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3) Search for a string in a word:In JavaScript, search() is used to search a string for specified value.
It returns the position of matching string otherwise it returns -1.

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4) Substring: The substring() returns characters from a string between start and end indices but not including end.
The substr() returns substring from the specified index to specified length.

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5)String Replace: The replace() searches for a substring in the given string and then replace with new string.

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After clicking the button:



6) String Lowercase and Uppercase:
The toLowerCase() returns lower case letter characters of string.
The toUpperCase() returns upper case letter characters of string.

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7) String trim and cut: 
The trim() removes the white spaces from a string.
The slice() is used to extract the part of string.

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