CODEWITHSUNDEEP
javascriptarrays
Liondancer
Liondancer

Reputation: 16469

iterating array of objects and the key values in JS

I have an array of objects

var j = [{"v1":["1","2","3"]}, {"v2":["4","5","6"]}, {"v3":["7","8","9"]}];

I want to check against the object property and perform some sort of logic. I am new to JS so I'm not sure of all the methods I have access to. Basically I want to compare the key value of the object to a string. If the key and the string are the same, then I would remove that object from the array. I'm not sure how to iterate through the object's key in the array. 

var str = "v1";
for (var i in j) {
  if (i.key == str) {     // not sure how to access key value
    j.splice(i,1);
  }
}

Upvotes: 0

Views: 122

Answers (2)

jfriend00
jfriend00

Reputation: 707696

As we've been discussing in comments, there is seldom a reason to use an array of objects that each only have one property (unless you're using the array to maintain a specific order), so I thought perhaps your problem might be easier if the data was structured like this:

var j = {"v1":["1","2","3"], "v2":["4","5","6"], "v3":["7","8","9"]};

And, you could then iterate it like this:

for (var key in j) {
    console.log("j[" + key + "] = ", j[key]);
}

Working demo: http://jsfiddle.net/jfriend00/qdgzso1g/

Upvotes: 1

Royi Namir
Royi Namir

Reputation: 148624

Try this : 

var  j = [{"v1":["1","2","3"]}, {"v2":["4","5","6"]}, {"v3":["7","8","9"]}];

for (var i = 0; i < j.length; i++)
{
    for (var k in j[i]) //do use this if you need to iterate
    {
        if (k === "mySomething")
        {
            //...do your stuff
        }

    }
}

Edit

less verbose : 

 for (var i = 0; i < j.length; i++)
    {
            if ("mySomething" in j[i])
            {
                //...do your stuff
            }

    }

Upvotes: 2

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