adding array (list of values) to a json object

Question

I try to loop through some json (clustered twees from twitter) and count how often particular keywords (hashtags) are present so I can create an ordered list of frequent words.
this (19)
that (9)
hat (3)

this I've done by creating

var hashtags = [];

first time I add a new word i add th word and give the value 1

hashtags[new_tag] = 1;

the next time a find the same worj I just add to the number

hashtags[hashtag]+=1;

the result is a simple structure with words and values. I can list out what I need with

$.each(hashtags, function(i, val){
    console.log(i+ " - "+ val);
})

Now I realize I also nee to know what clusters these words where found in. So; I thing I need to add a list (array) to my "hashtags".

I guess what I try to create is a json structure like this:

hashtags: {"this": 19, clusters: [1,3,8]},{"that": 9, clusters: [1,2]}

How do I add the arrays to the hashtags object?

Arnaud Le Blanc · Accepted Answer · 2011-09-22 16:45:47Z

2

First create an object for holding the hashtags:

var hashtags = {};

Then if an hashtag has never been seen yet, initialize it:

hashtags[new_tag] = {
    count: 0,
    clusters: []
};

Increment counts:

hashtags[new_tag].count += 1;

Add cluster:

hashtags[new_tag].clusters.push(the_cluster);

answered Sep 22, 2011 at 16:45

Arnaud Le Blanc

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1 Comment

Eiriks Over a year ago

Perfect. It now both makes sense to me now, and the code works smoothly! Thanks.

gilly3 · Accepted Answer · 2011-09-22 16:56:19Z

1

What you want is an Object ({ }) for hashtags since you are using strings as keys, not an Array ([ ]) which you would be appropriate if you were using index as the key. I'd structure it like this:

var hashtags = {
    "this": { count: 19, clusters: [1, 3, 8] },
    "that": { count: 9, clusters: [1, 2] }
};

So, when you add a new hash tag, do it like this:

hashtags[new_tag] = { count: 1, clusters: [cluster] },

And, when you increment a hash tag, do this:

hashtags[hashtag].count++;
hashtags[hashtag].clusters.push(cluster);

answered Sep 22, 2011 at 16:56

gilly3

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1 Comment

Eiriks Over a year ago

Thanks for your comment, your explanation of the difference in notation between object {} and array [] made all the difference in my understanding of this.

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