How can I check to see if any values in an array show a value of true with an if statement?

Question

I have the following object:

var myObj = 
{"qId":"726112",
 "text":"xx",
 "answers":[{"answerId":null,
             "answerUId":1,
             "text":"xx",
             "correct":null,
             "response":false},
            {"answerId":null,
             "answerUId":2,
             "text":"xx",
             "correct":null,
             "response":false},
            {"answerId":null,
             "answerUId":4,
             "text":"xx",
             "correct":null,
             "response":false}]}

Can someone tell me how I can use an if statement to check if any one of the response fields has a value of true?

cant get ur requirement, please clarify, what do u mean by check if any one of the response fields has a value of true — Nitin Varpe, Mar 15 '14 at 12:08
The object has a property called answers which has an array of objects. If any of the response properties in those arrays has a value of true. That's what I need to know. — , Mar 15 '14 at 12:10

score 3 · Accepted Answer · answered Mar 15 '14 at 12:08

3

You can use Array.prototype.some function, which returns true if atleast one of the elements return true, like this

if (myObj.answers.some(function(answer) { return answer.response; })) {
    # Atleast one of them is true
}

Working demo

answered Mar 15 '14 at 12:08

thefourtheye

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java.mypassion · Answer 2 · 2014-03-15T13:24:08.863

If you want to find is it true or false change status of response in Array . you can easily understood.

var myObj = {"qId":"726112",

"text":"xx",

"answers": [{"answerId":null, "answerUId":1, "text":"xx", "correct":null, "response":true},

        {"answerId":null,
         "answerUId":2,
         "text":"xx",
         "correct":null,
         "response":false},

        {"answerId":null,
         "answerUId":4,
         "text":"xx",
         "correct":null,
         "response":true}]
};

if(myObj.answers.length > 0){

for (var i in myObj.answers){

    if(myObj.answers[i].response){
        console.log(i+"th  index of answers Array in myObj object has   "+myObj.answers[i].response);
    }
    else{

    console.log(i+"th  index of answers Array in myObj object has   "+myObj.answers[i].response);

    }
}

}

output :

0th index of answers Array in myObj object has true

1th index of answers Array in myObj object has false

2th index of answers Array in myObj object has true

http://stackoverflow.com/questions/500504/why-is-using-for-in-with-array-iteration-such-a-bad-idea and formatting the code and output would be helpful. — Xotic750, Mar 15 '14 at 13:51

How can I check to see if any values in an array show a value of true with an if statement?

2 Answers2