Need to use a function inside the map of a list

I’m just learning JavaScript and I’m trying to do the following. Let’s say I have the following function:

f(a,b) {return(a+b)}

And now I have a list of for example the following:

list = [1,2,3]

What I would like to do is map for that list in which I call the function above f with a predefined value and each value of the list. I’ve tried this:

listB = list.map(x => f(x+23))

But it returns a NaN, and if I add some brackets that snippet returns undefined.

What’s going on and how can I solve it?

>Solution :

Should be f(x, 23) instead of f(x + 23):

function f(a,b) {return(a+b)}

listA = [1,2,3]
listB = listA.map(x => f(x,23))

console.log(listB)