CODEWITHSUNDEEP
javascriptunderscore.jslodash
Merlin
Merlin

Reputation: 25659

How do you update the properties of an object in javascript?

How do you update the properties of an object in javascript?
I would to update "id" of 68917 distance from 8.8 to 4.5... I have access to lodash.js 

[
      {
        "_id":68917,
        "Distance":8.81,
        "Lat":"42.65322175",
        "Lon":"-73.77398886"
      },
      {
        "_id":131277,
        "Distance":"9.86",
        "Lat":"42.654658",
        "Lon":"-73.805866"
      },
      {
        "_id":62450,
        "Distance":6.58,
        "Lat":"42.67457566",
        "Lon":"-73.74902171"
      }]

Upvotes: 0

Views: 153

Answers (3)

Makotosan
Makotosan

Reputation: 1149

You could use the built-in "filter" function to get the item you want.

someObject.filter(function(item){return item._id === 68917;})[0].Distance = 4.5;

Here is an example:

http://jsfiddle.net/aVBx8/

Upvotes: 1

Joeppie
Joeppie

Reputation: 447

The code you have provided provides an array. If this is is representative of your code, you can then iterate over the objects in the array using a for loop:

If you assign the provided code to a variable named array, you can use this code to iterate over the items in the array.

Once you do that, you can then access the properties of the objects inside using the dot operator, locating and updating the correct item.

function echo (text){
    document.getElementById("output").innerHTML += text + "<br/>"
}


var array = [
  {
    "_id":68917,
    "Distance":8.81,
    "Lat":"42.65322175",
    "Lon":"-73.77398886"
  },
  {
    "_id":131277,
    "Distance":"9.86",
    "Lat":"42.654658",
    "Lon":"-73.805866"
  },
  {
    "_id":62450,
    "Distance":6.58,
    "Lat":"42.67457566",
    "Lon":"-73.74902171"
  }];


echo("First item's distance " + array[0].Distance);

for(var i = 0; i < array.length;  i++){
    if(array[i]._id === 68917){
        echo("Found item "+array[i]._id);
        array[i].Distance = 4.45;
    }
}

echo("First item's distance " + array[0].Distance);

I created a JS Fiddle that demonstrates this solution works; http://jsfiddle.net/gB5Nn/2/

Upvotes: 1

ch2500
ch2500

Reputation: 240

your_object[0].Distance = 4.5;

If you don't know the index beforehand:

_.findWhere(your_object, {'_id': 68917}).Distance = 4.5;

Upvotes: 5

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