//Here are the commonly used JavaScript String methods:
Method Description
charAt(index) returns the character at the specified index
concat() joins two or more strings
replace() replaces a string with another string
split() converts the string to an array of strings
substr(start, length) returns a part of a string
substring(start,end) returns a part of a string
slice(start, end) returns a part of a string
toLowerCase() returns the passed string in lower case
toUpperCase() returns the passed string in upper9 case
trim() removes whitespace from the strings
includes() searches for a string and returns a boolean value
search() searches for a string and returns a position of a match