check if a character is an operator javascript code example

Example 1: c check if char is an operator

char o = '+';	//Or some other character

if (o == '%' || o == '/' || o == '*' || o == '+' || o == '-') {
	//Do something
    //...
}

Example 2: check if something is a letter in js

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