No reason is stated for why "always favor function declaration over function express"

[Morgan Cheng]

Here https://github.com/bevacqua/js#functions .

IMHO, function declaration is preferred since it is easy for debugging.

[Nicolás Bevacqua]

Because hoisting

[Morgan Cheng]

Sorry, but can you be more clear?

Do you mean function express is bad in below case?

foo(); //  foo is undefined here
var foo = function() {
}

function declaration always works

foo(); //  foo is a function here
function foo() {
}

[Nicolás Bevacqua]

Yeah, that's what I mean. Since expression assignment doesn't get hoisted, it's inherently worse than using a function declaration instead