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JavaScript JavaScript Loops, Arrays and Objects Tracking Data Using Objects Mixing and Matching Arrays and Objects

Arikaturika Tumojenko
Arikaturika Tumojenko
8,897 Points
Posted by Arikaturika Tumojenko
Arikaturika Tumojenko
8,897 Points

Can someone please explain this syntax?

I have this code

 var questions = [
{ question: "How many days are in a week?", answer: 7 },
{question: "How many weeks are in a month?", answer: 4},
{question: "How many months are in a year?", answer: 12 }
]

and this piece of code

for (var i = 0; i < questions.length; i += 1) {

    var question = questions[i].question;  


    var answer = questions[i].answer;

My questions are:

  • even if we changed the syntax, the objects are still seen as arrays? (therefore, we can access the array using index values - like here:
var question = questions[i].question;
  • How come to access the value of "question" we use .question? Shouldn't we be using square brackets to get to a property's value?

1 Answer

Steven Parker
Steven Parker
231,236 Points
Steven Parker
Steven Parker
231,236 Points

:point_right: You can access the object value either way:

questions[1].question     // you can use the DOT notation
questions[1]["question"]  // or you can put the property name in brackets

Either way gives the same result.

Remember that questions is an array of objects.

Arikaturika Tumojenko
Arikaturika Tumojenko
8,897 Points
Arikaturika Tumojenko
Arikaturika Tumojenko
8,897 Points

Therefore, each object has an index value. Now it makes sense why using the index notation. Thx a lot.