Find index in array of objects

Question

I would like to find index in array. Positions in array are objects, and I want to filter on their properties. I know which keys I want to filter and their values. Problem is to get index of array which meets the criteria.

For now I made code to filter data and gives me back object data, but not index of array.

var data =  [
        {
            "text":"one","siteid":"1","chid":"default","userid":"8","time":1374156747
        },
        {
            "text":"two","siteid":"1","chid":"default","userid":"7","time":1374156735
        }
    ];

var filterparams = {userid:'7', chid: 'default'};

function getIndexOfArray(thelist, props){
    var pnames = _.keys(props)
    return _.find(thelist, function(obj){
        return _.all(pnames, function(pname){return obj[pname] == props[pname]})
    })};

var check = getIndexOfArray(data, filterparams ); // Want to get '2', not key => val

not really an answer but you could have used _.findWhere to get exactly the same result as what you have now — soulcheck
– soulcheck, Commented Jul 18, 2013 at 16:18

idbehold · Accepted Answer · 2013-07-18 17:27:28Z

11

Using Lo-Dash in place of underscore you can do it pretty easily with _.findIndex().

var index = _.findIndex(array, { userid: '7', chid: 'default' })

answered Jul 18, 2013 at 17:27

idbehold

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Comments

Vinod Louis · Accepted Answer · 2013-07-18 16:38:48Z

2

here is thefiddle hope it helps you

 for(var intIndex=0;intIndex < data.length; intIndex++){
  eachobj = data[intIndex];
var flag = true;
 for (var k in filterparams) {

    if (eachobj.hasOwnProperty(k)) {
        if(eachobj[k].toString() != filterparams[k].toString()){
           flag = false;
        }
    }
}
if(flag){
       alert(intIndex);
}

}

answered Jul 18, 2013 at 16:38

Vinod Louis

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Comments

gustavohenke · Accepted Answer · 2013-07-18 16:35:21Z

2

I'm not sure, but I think that this is what you need:

var data =  [{
    "text":"one","siteid":"1","chid":"default","userid":"8","time":1374156747
}, {
    "text":"two","siteid":"1","chid":"default","userid":"7","time":1374156735
}];
var filterparams = {userid:'7', chid: 'default'};

var index = data.indexOf( _.findWhere( data, filterparams ) );

answered Jul 18, 2013 at 16:35

gustavohenke

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1 Comment

Seth Over a year ago

This should be the accepted answer since it IS using underscore.

James Daly · Accepted Answer · 2013-07-18 16:30:39Z

0

I don't think you need underscore for that just regular ole js - hope this is what you are looking for

var data =  [
        {
            "text":"one","siteid":"1","chid":"default","userid":"8","time":1374156747
        },
        {
            "text":"two","siteid":"1","chid":"default","userid":"7","time":1374156735
        }
    ];

var userid = "userid"
var filterparams = {userid:'7', chid: 'default'};
var index;
for (i=0; i < data.length; i++) {
    for (prop in data[i]) {
        if ((prop === userid) && (data[i]['userid'] === filterparams.userid)) {
            index = i
        }
    }
}

alert(index);

answered Jul 18, 2013 at 16:30

James Daly

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3 Comments

Bergi Over a year ago

I think he wants an indexOf not a lastIndexOf…

Bergi Over a year ago

What's that prop === userid thing supposed to do there? Can't you omit the property enumeration of data[i] then entirely?

James Daly Over a year ago

prop === userid has to equal the object's key value which I just stored in a variable

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