function A () {} and var A = function A () {}.
function A () {} and var A = function A () {}.
1.function A () {} is the function declaration
2.var A = function A () {} is an expression, assigning a reference to function A to a variable A
1 has the problem of declaring promotion while 2 will not.
function A() {}
var A = function() {};
var A = function A() {};
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