javascript building a json object using a for loop

Question

I have the following object:

var json = {
    "0": (entry.points[0]) ? entry.points[0].points : '-',
    "1": (entry.points[1]) ? entry.points[1].points : '-',
    "2": (entry.points[2]) ? entry.points[2].points : '-',
    "3": (entry.points[3]) ? entry.points[3].points : '-',
    "4": (entry.points[4]) ? entry.points[4].points : '-',
    ...
}

What I want is to build that json in a for loop, and all the numbers will be the index. Is this possible?

dfsq · Accepted Answer · 2015-03-19 21:11:40Z

2

Like this, for example:

var json = {};
for (var i = 0; i < entry.points.length; i++) {
    json[i] = entry.points[i] ? entry.points[i].points : '-';
}

answered Mar 19, 2015 at 21:11

dfsq

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4 Comments

Stephan Bijzitter Over a year ago

And then: JSON.stringify(json)

dfsq Over a year ago

I think that OP want object, json is just unfortunate name.

Egidi Over a year ago

@dfsq why does json[i] add the keys to the beginning of json? I mean if i had json = { "some": "thing"} the "some" key will be the last one!! how can I push those keys in the loop to the end of the json?

dfsq Over a year ago

@Egidi There is no beginning or end in this case, this is just how browser renders it. Object doesn't have notion of properties order. If you need ordered properties you need to use array, not an object.

ArinCool · Accepted Answer · 2015-03-19 21:12:48Z

0

Try this:

var json = {};
for(var i=0; i<entry.points.length; i++) {
 json[i] = (entry.points[i]) ? entry.points[i].points : '-'
}

answered Mar 19, 2015 at 21:12

ArinCool

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