JavaScript plus unary operator returns NaN

Question

When trying to convert a string to number in a browser console:

let a="3,437,286"
+a

returns NaN. Do you see what am I missing here?

Answer 1

That string isn't a proper number. Maybe if the string always has numbers with commas, you can remove the commas and try to check it:

let a = "3,437,286";
console.log(+a);                    // NaN
console.log(+a.replace(/,/g, ""));  // 3437286