Finding

indexof

The indexof method returns the position of the first occurrence of a specified value in a string
This returns -1 if the value does not exist.
This method is case sensitive.

lastindexof

The lastindexof method returns the position of the last occurrence of a specified value in a string
This returns -1 if the value does not exist.
This method is case sensitive.

search

Returns the character position

var indexOfA = myString.search("A"); 
var indexOfK = myString.search("K"); 

startswith

2 parameters

endswith

2 parameters

myString.endswith(searchstring, endposition) 

endposition - where the search ends

includes

Returns true or false

myString.includes("A")