How to Efficiently Find an Object by its ID in an Array of Objects?

Finding an Object by Property in an Array of Objects

Given an array of objects where each object has an "ID" property, we need to identify and retrieve the object that matches a specific value for the ID property. Let's consider an array named $array with objects having "ID" and "name" properties.

To approach this problem, there are two common strategies:

1. Array Iteration:

This involves looping through each object in the array and checking if its "ID" property matches the desired value. This approach is straightforward but can be inefficient for large arrays.

$item = null;
foreach ($array as $struct) {
    if ($v == $struct->ID) {
        $item = $struct;
        break;
    }
}

2. Hashmap Creation:

We can create a hashmap that uses the "ID" property as keys and the objects as values. This allows us to access the desired object directly based on its ID.

$hashmap = [];
foreach ($array as $struct) {
    $hashmap[$struct->ID] = $struct;
}

$item = $hashmap[$v];

If performance is a concern, the hashmap creation approach is generally preferred for large arrays. However, for small arrays, the simplicity of array iteration may be more suitable.

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