1.slice(start, end)
2. substring (start, end)
3. substr(start, end)
the slice() method extract the part of a string
the slice() method extract the part of a string with negative parameter
the substring() method extract a part of a string and return the extracted string into new one
the substr() method extract a part of a string and return the extracted string into new one
Repalce function works by replace()
convert string to uppercase
convert string to lowercase
the concat() method join 2 or more strings