JavaScript function declarations in Native browser and Node.js, get differnt results [duplicate]

Question

The code below will get different in Browser and Node.js.

Result of browser is a.

Result of Node.js is b.

if (1) {
    function foo() { return 'a'; }
} else {
    function foo() { return 'b'; }
}

console.log(foo());

Although this code style is anti-pattern, the code still can be run in environment.

How to explain it?

---

FYI.

• Node.js environment Link: https://repl.it/CgWh

• Native Browser environment Link: https://repl.it/CgWj

These links maybe not permanent.

Answer 1

Javascript engines are not hoisting javascript function the same way, so you can expect different behavior between browser/node.

One exemple of this: http://statichtml.com/2011/spidermonkey-function-hoisting.html