Search for all items that share the same identification numbers in JavaScript

Trying to parse through my students array to find all objects with matching ids and extract other property values from them has been challenging...

Consider the following sample array:

const students = [
    {id: 1, name: 'Cal', location: 'McHale' },
    {id: 2, name: 'Courtney', location: 'Sydney Hall' }, 
    {id: 1, name: 'Cal', location: 'Syndey hall' }
]

In this scenario, the desired output would be retrieving all instances with id: 1.

{id: 1, name: 'Cal', location: 'McHale' },
{id: 1, name: 'Cal', location: 'Syndey hall' }

The end goal is to eventually eliminate duplicate names and present them in a list format like the one below... (Although that step can come later. Right now, the focus is on selecting matching objects).

Id: 1    Name: Cal    Location: McHale
                                Syndey Hall

I have attempted using:

const result = _.find(students, {student_id: studentId});

However, this approach does not yield the desired outcome; it only retrieves one object with that specific id..

{id: 1, name: 'Cal', location: 'McHale' },

Is there a way to make this work effectively?

Answer №1

If you're looking for a way to narrow down elements in an array based on a certain criteria, the filter function in JavaScript could be your solution.

Here is a simple example to demonstrate how it can be used. You just need to create a function that determines if the element meets the specified condition.

function isBigEnough(value) {
  return value >= 10;
}
var filtered = [12, 5, 8, 130, 44].filter(isBigEnough);
// filtered is [12, 130, 44]

Answer №2

When looking at the documentation for _.find, it explains:

This method iterates through the elements of a collection and returns the first element that meets the specified condition.


For your specific requirements, using the _.filter method would be more suitable.

With this method, you can iterate through the collection and create an array containing all elements that meet the given condition.

An example implementation could look like this:

const result = _.filter(students, {student_id: studentId});

Answer №3

let filteredStudent = students.find(person => person.studentID === 1);

Answer №4

When using the find method, only the first matching element will be returned, even if there are more elements that meet the condition.

If you need to retrieve all matching elements, you should utilize the .filter method instead.

Although the implementation is similar, the output differs between an object (from .find()) and an array (from .filter()).

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