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JavaScript Express Basics Parameters, Query Strings, and Modularizing Routes Card Template

Akshit Jindal
Akshit Jindal
1,341 Points
Posted by Akshit Jindal
Akshit Jindal
1,341 Points

Why not using const text=cards[req.params.id].side?

We are using const text=cards[req.params.id][side] in the code. As side is the variable with value as "question" or "answer" and "question" or "answer" are the property of every card, then why const text=cards[req.params.id].side is not working. Thanks in advance.

1 Answer

Zimo Dong
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Zimo Dong
Full Stack JavaScript Techdegree Student 10,755 Points
Zimo Dong
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Zimo Dong
Full Stack JavaScript Techdegree Student 10,755 Points

side is a variable, in order to access object properties with variables use object[variableName] instead of object.variableName, you can find more info here : https://www.youtube.com/watch?v=aOZUAGucvdo

Seokhyun Wie
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Seokhyun Wie
Full Stack JavaScript Techdegree Graduate 21,606 Points
Seokhyun Wie
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Seokhyun Wie
Full Stack JavaScript Techdegree Graduate 21,606 Points

Zimo Dong So it means that [side] is not an actual key name, but a variable, so you cannot use with dot notation. Am I right? Guess you're already long gone since you answered on 2017, but if anyone knows I am right or wrong, any answer will be appreciated. Thanks.

JASON LEE
JASON LEE
17,351 Points

Seokhyun Wie ,

cards[id].side =/ cards[id][side]

cards[id].side === cards[id]["side"]

But "side" does not exist as a property of cards.

if side === "question", then cards[id][side] === cards[id].question

Since side is a variable which the value can change, we have to reference using bracket notation.