Question

I have the following javascript.

var f = function() { ... };
if (x === 1) {
    // redefine f.
    f = function() { 
       ...
    };
}

Is that code valid ?
In other words can I redefine a javascript function inside an if statement where I actually write the code.

I am worried because of this:
Function declarations inside if/else statements?

Answer 1

Yes you can do that.

f = function() { 
   ...
};

is not a function declaration, it is a function expression (assigned to f), so the problems mentioned in the other question don’t apply here.

Only variable and function declarations are hoisted.