<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Testing Selections and Booleans</title>
</head>
<body>
<h1>Testing Selections!</h1>
<script>
var red = true;
var blue = false;
var green = 0;
if(green){
console.log("the statement is true!");
}
else {
console.log("the statement is false!");
}
</script>
</body>
</html>green에 아무 값이 없거나 (undefined)
null값을 넣어주거나
0을 넣어주면
콘솔에 모두 false로 찍힘
False, undefined, null are not a number
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