get ascii value of char javascript

let ascii = 'a'.charCodeAt(0); // 97
let char = String.fromCharCode(ascii); // 'a'"ABC".charCodeAt(0) // returns 65var myVar='A';
var myVarAscii = myVar.charCodeAt(0); //convert 'A' character to it's ASCII code (65)console.log(String.fromCharCode(65));
// expected output: "A"
'a'.charCodeAt(0)//returns 97, where '0' is the index of the string 'a'word = userInput[0]; //abc
var sum =0;
for(i=0;i<word.length;i++)
{
    sum = sum + word.charCodeAt(i);
}
console.log(sum); //294