Answers for "javascript how to check if letter in string"

javascript check if string contains character

var str = "We got a poop cleanup on isle 4.";
if(str.indexOf("poop") !== -1){
	alert("Not again");
}
//use indexOf (it returns position of substring or -1 if not found)

check if something is a letter in js

string.charAt(1).toUpperCase() !== string.charAt(1).toLowerCase()