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JavaScript JavaScript Basics (Retired) Storing and Tracking Information with Variables Review Creating and Naming Variables

Posted by Jessica Andhika
Jessica Andhika
257 Points

why is this incorrect? var timeRemaining = 0;

the question was to fill in the blank below, showing the variable timeRemaining and not to put any values.. var[blank];

2 Answers

Fernando Boza
Fernando Boza
25,384 Points
Fernando Boza
Fernando Boza
25,384 Points

Hi Jessica, basically 0 is still a value, so

var example = 0 ... you're placing the number 0 in the variable.

To make an empty variable just add nothing, literally. var example;

Kai Nightmode
Kai Nightmode
37,045 Points
Kai Nightmode
Kai Nightmode
37,045 Points

Zero is something in JavaScript. Specifically zero is a number.

I think it can help to see what JavaScript considers things by running the following code to double check.

var timeRemaining;
console.log('"var timeRemaining" is of the type: ' + typeof(timeRemaining)) // undefined

timeRemaining = 0;
console.log('"timeRemaining = 0" is of the type: ' + typeof(timeRemaining)) // number

timeRemaining = 'hello';
console.log('"timeRemaining = \'hello\'" is of the type: ' + typeof(timeRemaining)) // string

Try running the above code to double check and see how the type of timeRemaining changes depending on what you do or do not assign to it. :)