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Mahfuzur Rahman
3,204 Pointsvariables with 'false' Boolean value
Although I've watched the lesson video 3-4 times, I am confused here with what's happening behind the scene.
- var isAdmin=false; if(isAdmin=false) // what's actually happening in the if condition test? Am I alerted that welcome admin? but why? Isn't the isAdmin value false? or has it become true for the if condition used?
var isAdmin = false;
var isStudent = false;
if ( isAdmin ) {
alert('Welcome administrator');
} else if (isStudent) {
alert('Welcome student');
}
else(true) {
alert('who are you?');
}
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JavaScript Basics</title>
</head>
<body>
<script src="script.js"></script>
</body>
</html>
4 Answers
Steven Parker
229,786 PointsFor a boolean value, you need to only name it in a conditional expression to test it. So the code: "if (isAdmin)" is checking if isAdmin is true. So given the code shown, it should not show the alert message.
Also, there is an error in the final "else" statement. A plain "else" does not take a conditional expression. It does not need one since it will handle any condition not previously handed by the "if" or "else if" statements.
Osaro Igbinovia
Full Stack JavaScript Techdegree Student 15,928 PointsHi Rahman, in the challenge the 'isAdmin' and 'isStudent' variables have already been set to false i.e. given a boolean value of false. In a conditional statement, the test in an 'if' statement has two outcomes regardless of the circumstances. The test is either true or false, and if the test is false, the JavaScript interpreter goes to the next else-if clause and checks the test, and so on. If all the tests in the multiple clauses of a conditional statement is false, the code block in the last else clause will run.
Since both variables in the challenge are false, its the code block in the else clause you are to add that will run, and you don't add a test with an else clause in JavaScript because it's the last resort when all possible outcomes is false. So just delete that (true) beside the else clause and you're good to go.
Ying Chen
2,353 Pointsconst isAdmin = false; const isStudent = true; let message;
if ( isAdmin ) { message = 'Welcome admin'; } else if { message = "Sorry, you are not an admin"; }
Will Ragan
1,673 Pointscan someone help me please!!!!!
Steven Parker
229,786 PointsHelp you with what? It would be best to start a fresh question using the "Get Help" button on the course page.