is any JavaScript statement an expression?

Question

I know that functional languages like Lisp don't have statements. Everything there is an expression. JavaScript is a functional language. So I came to a conclusion that every JavaScript statement is an expression. This thought came to my mind when I was playing with chrome's console. Every statement entered there is evaluated and the console returns undefined if an expression doesn't return certain value.

Accepted Answer

I'd say no, as you can't use just any statement where an expression is expected:

```
// SyntaxError: Unexpected token var
var a = var b;
```

```
// SyntaxError: Unexpected token if
var c = if (true) {};
```

The `undefined` shown in Chrome's console is due to its use of `eval()` (or a native/internal equivalent), which evaluates any code:

```
var a = eval('var b;');
console.log(a); // undefined
```

The `undefined` isn't the result of `var b;`, but because `eval()` itself still has a return value -- whether the evaluated code supplied it or not.

is any JavaScript statement an expression?

Solution

Problem