get ascii value of char javascript

1let ascii = 'a'.charCodeAt(0); // 97
2let char = String.fromCharCode(ascii); // 'a'

1"ABC".charCodeAt(0) // returns 65

1'a'.charCodeAt(0)//returns 97, where '0' is the index of the string 'a'

1console.log(String.fromCharCode(65));
2// expected output: "A"
3

1String.fromCharCode(65,66,67); // returns 'ABC'

1word = userInput[0]; //abc
2var sum =0;
3for(i=0;i<word.length;i++)
4{
5    sum = sum + word.charCodeAt(i);
6}
7console.log(sum); //294