Fun Javascript behavior

gistfile1.js

if(function test(a){console.log(a)}) { console.log(test('test')) }
// ReferenceError : test is not defined

var test;
if(test = (function(a){console.log(a)})) { console.log(test('test')) }
// test

Tested in Google Chrome

Dynamic unnamed function:

var foo = function (a) { console.log(a); };

foo('test'); // OK

Dynamic named function:

var foo = function test (a) { console.log(a); };

foo('test'); // OK
test('test'); // ReferenceError
console.log(foo.name); // 'test'

The, well, standard (?) function:

function test (a) { console.log(a) }

test('a'); // OK