JavaScript find matching object in an array of objects

Question

Hi I have an array of objects

[
 {
 outletId: 619734
 tleaderId: "3f8be9bf-5920-4d3d-b915-50ca76cb21oo"
 },
 {
 outletId: 619755
 tleaderId: "3f8be9bf-5920-4d3d-b915-50ca76cb24ty" 
 },
 {
 outletId: 619700
 tleaderId: "3f8be9bf-5920-4d3d-b915-50ca76cb2qwe" 
 }
 // and so on...
]

Then I'm creating another object

[
 {
 outletId: 619734
 tleaderId: "3f8be9bf-5920-4d3d-b915-50ca76cb21oo"
 }
]

And I want to find if the new created object matches any of the object in the array. I tried this with no luck

$.each(objCollection, function () {
 if (this === newObject) {
 alert("Already exist!!!");
 }
});

Any idea?

Thanks in advance

• Su4p: show me where you instanciate newObject
• Anthony Grist: The === operator is only going to work if they're literally the same object. Not just have the same properties, but refer to the same memory address. You'll need a function that compares two objects that you can call.
• Su4p: yes ok you said it "Then I'm creating another object" it's a new object so it will never be the same. Make a function to compare the two objects like @AnthonyGrist said.

Answer 1

Try this:

var exists = array.some(function(obj){
 return obj.outletId == search.outletId && obj.tleaderId == search.tleaderId;
});
if(exists){
 alert("Already exist!!!");
}

This assumes the object you're looking for is stored in a search variable:

var search = {
 outletId: 619734
 tleaderId: "3f8be9bf-5920-4d3d-b915-50ca76cb21oo"
}

• Batu.Khan: This is not gonna work based on OP example cuz search object is inside an array so you need to write search[0].outletId and search[0].tleaderId
• Alnitak: Actually you want array.some, not array.filter. Not only does it automatically give you a boolean result, it short circuits the for loop as soon as a match is found.
• Alnitak: @Mauro74 IMHO this should have been the accepted answer
• Mauro74: @Alnitak I need it to work in IE8 so the accepted answer I've picked is the one that works best for my project.
• Cerbrus: @Mauro74: I'd suggest using the polyfill provided in the MDN's documentation for IE8 compatibility.

Answer 2

If I've understood your question correctly, you want something like this DEMO ?

var array = [{
 outletId: 619734,
 tleaderId: "3f8be9bf-5920-4d3d-b915-50ca76cb21oo"
}, {
 outletId: 619755,
 tleaderId: "3f8be9bf-5920-4d3d-b915-50ca76cb24ty"
}, {
 outletId: 619700,
 tleaderId: "3f8be9bf-5920-4d3d-b915-50ca76cb2qwe"
}
// and so on...
]
var newArray = [{
 outletId: 619734,
 tleaderId: "3f8be9bf-5920-4d3d-b915-50ca76cb21oo"
}];
function matchCase(array1,array2){
 var matchFound = false;
 for (var i = 0; i < array1.length; i++) {
 item = array1[i];
 if (item.outletId === array2[0].outletId && item.tleaderId === array2[0].tleaderId) {
 matchFound = true;
 break;
 }
 }
 return matchFound;
}
console.log(matchCase(array,newArray));

• Alnitak: IMHO, that callback passing is horrible, and completely unnecessary, and doesn't provide sensible logic for the case when the entry isn't found. The code isn't async, so just have matchCase return a boolean.
• Cerbrus: ... Why did you add a callback like that? o.O
• W.D.: @Cerbrus, Just did it the hard way, didn't think of the case that I can simply return the found item if any, and if nothing is found return "".

Answer 3

linking: Check this http://jsfiddle.net/taN4Z/ //checking new array values within old one

 $.each(obj2, function (key1,val1) {
 $.each(obj1, function (key2,val2) {
 if(val1.outletId==val2.outletId){
 alert("Already exist!!!"+val1.outletId);
 }
 }); 
 });

Here obj2 ( new array ) values are checked with the old array ( obj1 ) values .