How can I take a field out of an array in Javascript and make another array

Question

I'm sending data from my client like this:

data = {
    Checked: ??
    Matches: null,
    Text: null,              
}

My data is stored like this:

var a = {
     "Answers": [
         {
             "answerUId":1,
             "correct":true,
             "checked":true,
             "text":"`public`"
         },
         {
             "answerUId":2,
             "correct":false,
             "checked":true,
             "text":"`static`"
         }
   ]
}

How can I get out the values of just the checked field and use it to make another array but with just the one parameter so I can use this to replace the ?? in my code?

What I need is:

[ true,
  false ]

means you just want those Answers which has checked:true? — Mritunjay
– Mritunjay, Commented Jul 21, 2014 at 7:13
What exactly do you want? An array with just the value of checked from ever set of data? — KhorneHoly
– KhorneHoly, Commented Jul 21, 2014 at 7:14
I updated the question to show in more detail what I am looking for. I think just a simple array where each row has one value of true or false. — Alan2
– Alan2, Commented Jul 21, 2014 at 7:28

Mritunjay · Accepted Answer · 2014-07-21 07:58:40Z

1

If I understood your problem correctly, This should work for you

var a = 
{"Answers":
   [
    {"answerUId":1,
     "correct":true,
     "checked":true,
     "text":"`public`"},
    {"answerUId":2,
     "correct":false,
     "checked":true,
     "text":"`static`"},
     {"answerUId":3,
     "correct":false,
     "checked":false,
     "text":"`static`"}
   ]
}

var checkedAnswers = a.Answers.map(function (answer) {
    return answer.checked;
})

console.log(checkedAnswers);

CheckedAnswers will be an array like bellow

[ true, true, false ]

edited Jul 21, 2014 at 7:58

answered Jul 21, 2014 at 7:16

Mritunjay

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2 Comments

Alan2 Over a year ago

Sorry maybe I did not explain well. I just added to the questin to show what I think is needed.

Mritunjay Over a year ago

@Alan no Probs , I just updates my answer, just change filter to map.

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