Function Declarations vs. Function Expressions

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Function Declaration
function X() { return "hello"; }
function Y() { return X(); }
function Z() { return Y(); }
Z();
ready
Function Expression
var X = function () { return "hello"; };
var Y = function () { return X(); };
var Z = function () { return Y(); };
Z();
ready
Function Expression 2
var X = function () { return "hello"; },
Y = function () { return X(); },
Z = function () { return Y(); };
Z();
ready

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