fetch into array of object in javascript [duplicate]

Question

i am trying to fetch into array of object.

i have : arrayOfObject :

0: {code: "YJYDWO1", route_id: 1}
1: {code: "YJYDWO2", route_id: 2}
2: {code: "YJYDWO3", route_id: 3}
3: {code: "YJYDWO4", route_id: 4}
4: {code: "YJYDWO5", route_id: 5}

I want to get object where route_id = 2 (example) using find or anything without for loop.

I do this using for loop:

for(let i=0; i<arrayOfObject.lenght; i++){
  if(arrayOfObjet[i].route_id == 2){
   // do what you want
}
}

that work but if i have 1 milion data object in arrayOfObject that take a large of time so i thing is better to do it using find or any method in javascript.

How to do this?

yes !, but i need other method like find hachset ... after some search hachset is more better for filter large data in small time. @Kinglish — lampard bre
– lampard bre, Commented Jul 2, 2021 at 6:47

derpirscher · Accepted Answer · 2021-07-02 06:52:37Z

2

You can use something like Array.find

let item = arrayOfObjects.find(x => x.route_id === 2)

But that is just hiding the for loop. Because iterating over the array is the only possibility to find the element.

To speed up the things a bit (if route_id are unique) you can break out of the loop once you found your element.

for (let element of arrayOfObject) {
  if (element.route_id === 2) {
    // Do your thing
    break;
  }
}

If you have to do many searches (and again route_id is unique) you probably should transform your array into a a map or something similar, so you can directly access the object by its key

// Do this once in the beginning
let m = new Map();
for (let e of arrayOfObject)
  m.set(e.route_id, e);


//Retrieve an element from the map
let x = m.get(2);

answered Jul 2, 2021 at 6:52

derpirscher

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