Javascript Object comparision

Question

I have the following javascript object

myData={my_ID: "NSOfe",his_ID: "AuJ"}

I would like to compare my_Data and see whether or not I have same my_ID in the following javascript objects (myData_1). If there is, it will return true on the console.

myData1=[{my_ID: "NSOfe",his_ID: "suJ"},{my_ID: "NSOfew",his_ID: "kuJ"},{my_ID: "NSOfey",his_ID: "BuJ"}]

Spencer Wieczorek · Accepted Answer · 2015-05-12 19:09:53Z

2

Then compare the my_ID attributes for the objects:

console.log(myData.my_ID === myData1.my_ID); // true

For many comparisons place your items into an array and use a for loop to go through them:

var dataArray = [ myData1, myData2, myData3 ];

for( var i = 0; i < dataArray.length; i++ )
    console.log(myData.my_ID === dataArray[i].my_ID);

edited May 12, 2015 at 19:09

answered May 12, 2015 at 19:06

Spencer Wieczorek

21.6k7 gold badges46 silver badges57 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Spencer Wieczorek Over a year ago

@ilyasUyanik Then place your objects in an array and go through them comparing them to myData. I've updated my answer to reflex that.

Brian · Accepted Answer · 2015-05-12 19:23:47Z

0

You can stringify the array and then simply do an indexOf call on it like so:

var myData=[{my_ID: "NSOfe",his_ID: "AuJ"},{my_ID: "NSOfe",his_ID: "AuJ"}];

var myDataString  = JSON.stringify(myData);

console.log(myDataString.indexOf('"my_ID":"NSOfe"') !== -1);
console.log(myDataString.indexOf('"my_ID":"NSOfe2"') !== -1);

Console ouput:

true
false

edited May 12, 2015 at 19:23

answered May 12, 2015 at 19:14

Brian

3,3345 gold badges34 silver badges44 bronze badges

4 Comments

Tiddo Over a year ago

This doesn't work properly. JSON can only represent a small subset of JavaScript objects. e.g. dates, regular expressions and functions are not supported. Other than that, for large objects it's extremely inefficient, and your -1 check only checks if that particular string is anywhere in the object. This problem can be solved easily by just inspecting the object.

Brian Over a year ago

@Tiddo, It works very properly for the original question

Tiddo Over a year ago

Although it technically, by accident, works for the exact situation proposed in the original question, it cannot be extended for any other similar question and it will fail as soon as there is only a slight change to the code. E.g. as soon as nested objects come into play it won't work. But more importantly, it's just a very bad way to do it. There's a trivial, proper solution to this problem, and string comparison is not it. "It works" is not a good enough motivation for a solution.

Brian Over a year ago

@Tiddo, I don't want to talk to you no more, you empty headed animal food trough whopper! I fart in your general direction! You mother was a hamster and your father smelt of elderberries!

Collectives™ on Stack Overflow

Javascript Object comparision

2 Answers 2

1 Comment

4 Comments

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

4 Comments

Related