Javascript Quiz help

Question

What is output of this code?
var app = 'a';
app = app.CharCodeAt();
console.log(app);
Output: 97

Really cant google answer to this have tried.

Answer 1

charCodeAt(x) is method that returns the unicode of the symbol specified by position "x".
Example
var app = 'abc';
app = app.CharCodeAt(1); // we choose position 1 of this string, so it means "b"
console.log(app);
Output: 98
So unicode of b is 98

Answer 2

@ThreeG thanks so CharCode is method for unicode and ASCII, something like that anyhow. 65 is A, tricky questions can be set in these quizes.

Answer 3

Fill in blanks to make the variable arr3 look like the following: [1, 2, 3, 4, 5, 6, 7, 8].

const

= [1, 2, 3];
const arr2 = [5, 6, 7, 8];
let arr3 = [

arr1,

, ...arr2];

please help me to slove this