Javasccript Find Element In Array Of Object

Let's say I have an array of objects and one of the properties of each object is TheID. Something like this: TheArray[0].TheID = 34; TheArray[1].TheID = 2352; ... I'm looking to r

Solution 1:

You could use break to leave the loop:

var TheIndex;
for (var i = 0; i < TheArray.length; i++) {
   if (TheArray[i].TheID == MagicNumber) {
      TheIndex = i;
      break;
   } 
}
return TheIndex;

Solution 2:

if (TheArray[i].TheID = MagicNumber) { return i; }

Solution 3:

Break; or return; within a loop to stop it once you have found what you are looking for. There is no other way to search arrays/objects for specific property values. You could consider re factoring your code entirely to avoid unnecessary performance sinks like this but that isn't always feasible.

Solution 4:

Even though this is from a while ago, another alternative that might be useful if you do many such searches would be to loop once an index based on your search criteria.

e.g. do this once:

var idToIdx={};
for (var i = 0; i < TheArray.length; i++) {
   idToIdx['I'+TheArray[i].TheID] = i
   } 
}

and then just use for idToIdx['I'+ MagicNumber] as many times as you need.