Add new object to existing array of objects jquery/javascript

Question

I have an array of objects (containing my stimuli) and a function (see extract below) that collects reaction times and 'pushes' all reaction times to a global variable.

var stim = [  {name:"A", path:".../a.jpg", type: P}, 
              {name:"A", path:".../a.jpg", type: T}, 
              {name:"A", path:".../a.jpg", type: I}
           ];

var reac_arr = [];

$(function(){ ...    var reac_time = t2-t1;
                     react_arr.push(reac_time);
            };

Now I want to add the variable with all my reaction times to stim as object "reaction". So that in the end I have the reaction time, the type, the path, and the name for all my stimuli, something like this:

var stim = [  {name:"A", path:".../a.jpg", type: P, reaction: 123}, 
              {name:"A", path:".../a.jpg", type: T, reaction: 876},
              {name:"A", path:".../a.jpg", type: I, reaction: 725}
           ];

I tried:

stim.reaction = react_arr;

but that's not working.

I need this to analyse how reaction times differ across different types of stimuli. I found answers on this for java but these weren't helping for my problem.

James Allardice · Accepted Answer · 2014-03-19 11:14:06Z

1

Assuming stim and reac_arr follow the same ordering:

stim.forEach(function (s, i) {
    s.reaction = reac_arr[i];
});

This loops over the stim array and adds a reaction property whose value is the value at the corresponding index of the reac_arr array to each object.

answered Mar 19, 2014 at 11:14

James Allardice

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2 Comments

ben_aaron Over a year ago

Thanks James, brilliant idea.Unfortunately the order of the stimuli for the stim array is randomised. Thus ultimately I want to have a possibility to see the reaction time for each stimulus. Can you think of a way to accomplish this?

James Allardice Over a year ago

Presumably you're accessing an object out of stim and using it to do some stuff and then calculate reac_time. If that's the case you should still have a reference to the object from stim and you can manipulate it directly.

vdubus · Accepted Answer · 2014-03-19 12:44:25Z

1

In your case, stim is a Array of Object, so stim.reaction = react_arr; won't work as you expect because you are in fact updating the reaction property from your stim Array.

That you want is to update the reaction property from one of the Object in your stim Array. So you should use :

stim[index].reaction = react_arr;

where index is the index of the object you want to update in stim.

edited Mar 19, 2014 at 12:44

answered Mar 19, 2014 at 12:37

vdubus

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Comments

Rahul · Accepted Answer · 2014-03-19 11:15:41Z

0

You should try something Like::

var reac_time = t2-t1;
var temp={name:"A", path:".../a.jpg", type: P, reaction: reac_time}
react_arr.push(temp);

answered Mar 19, 2014 at 11:15

Rahul

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Comments

Aameer · Accepted Answer · 2014-03-19 11:22:49Z

0

var stim = [  {name:"A", path:".../a.jpg"}, 
          {name:"A", path:".../a.jpg"}, 
          {name:"A", path:".../a.jpg"}
       ];
stim.pop({name:"A", path:".../a.jpg"});
stim.push({name:"A", path:".../a.jpg", reaction: 725});

you can iterate to get the result for all

answered Mar 19, 2014 at 11:22

Aameer

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