js if letter in string code example
Example 1: javascript contains substring
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)
Example 2: check if something is a letter in js
string.charAt(1).toUpperCase() !== string.charAt(1).toLowerCase()