How to get element from an array of objects?

Question

var fkTableArr1d = new Array();

fkTableArr1d = _.map(fkTableArr2d, function(list, iterator, context) {          
      return { "id " : list[0], "label " : list[1] };
    });

fkTableArr1d becomes: [Object, Object, Object]

1 object is a Object {id : "5", label : "fuel"}

Now how I'm supposed to get ID of an element with label fuel?

Below one doesn't work:

console.log(fkTableArr1d['fuel']);

Overdriven Fall, you are using the value 'fuel' as the index instead of finding which array object has this value. Check my answer. — Rajesh Paul
– Rajesh Paul, Commented Oct 29, 2013 at 12:03

Pavlo · Accepted Answer · 2013-10-29 12:06:50Z

2

Looks like you are looking for findWhere():

Looks through the list and returns the first value that matches all of the key-value pairs listed in properties.

_.findWhere(fkTableArr1d, {label : "fuel"});

Demo: http://jsfiddle.net/38qUE/1/

edited Oct 29, 2013 at 12:06

answered Oct 29, 2013 at 11:59

Pavlo

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3 Comments

van_folmert Over a year ago

it works, I had error in my array (I've created it by "id" : list[0], "label" : list[1] instead of id : list[0], label : list[1])

Pavlo Over a year ago

Using string literals (the ones with quotes) vs "raw" identifiers should make no difference here.

van_folmert Over a year ago

somehow it did, because with string literals it didn't recognize .id, .label

AxelPAL · Accepted Answer · 2013-10-29 11:49:32Z

0

var id = 0;
if(fkTableArr1d.label = 'fuel') id = fkTableArr1d.id;

Fiddle

answered Oct 29, 2013 at 11:49

AxelPAL

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Comments

Rajesh Paul · Accepted Answer · 2013-10-29 12:18:20Z

0

use any the following code snippets:

snippet1:

fkTableArr1d =[{id : "5", label : "fuel1"}, {id : "6", label : "fuel"}, {id : "4", label : "fuel2"}];
for(x in fkTableArr1d)
    if(fkTableArr1d[x].label == 'fuel')
        alert(fkTableArr1d[x]['id']);//syntax1 for accessing object member. alerts '6'.

fiddle1

snippet2:

fkTableArr1d =[{id : "5", label : "fuel1"}, {id : "6", label : "fuel"}, {id : "4", label : "fuel2"}];
for(x in fkTableArr1d)
    if(fkTableArr1d[x].label == 'fuel')
        alert(fkTableArr1d[x].id);//syntax2 for accessing object member. alerts '6'.

fiddle2

edited Oct 29, 2013 at 12:18

answered Oct 29, 2013 at 11:54

Rajesh Paul

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5 Comments

van_folmert Over a year ago

I get undefined when I try for(x in fkTableArr1d) console.log(fkTableArr1d[x].id); or fkTableArr1d[x]['id']

Pavlo Over a year ago

You need var before x. Right now you are defining it as global.

Rajesh Paul Over a year ago

@OverdrivenFall Please check the fiddle I have given. Perfectly working in the fiddle.

Rajesh Paul Over a year ago

@Pavlo, Please check the fiddle. var is needed only when to declare x locally. But there is no such restriction here.

Rajesh Paul Over a year ago

@Pavlo I completely agree with you. But didnt think of it too much to demonstrate this.

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