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global/local

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var a = 4;
function add(first, second) {
	var a = first;
	return a + second;
}
write("1 + 2 = " + add(1,2));       // 3
write("a: " + a);                   // 4 cuz its not refrencing the function add, which would use a as 54


function add(first, second) {
	a = first;
	return a + second;
}
write("1 + 2 = " + add(1,2));       // 3
write("a: " + a);                   // 1 cuz the only a it knows about is the one inside the function, which has beem set to first (1)


function add(first, second) {
	var a = first;
	return a + second;
}
write("1 + 2 = " + add(1,2));       // 3
write("a: " + a);                   // error cuz global a isn't defined. (local a is) 

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