How to Filter Objects in a JavaScript Array Based on a Specific Property Value?

Finding Objects in Arrays Using Property-Based Filtering in JavaScript

Question:

Given an array of objects, how can you find and extract objects based on a specific property and its value?

Input:

<code class="javascript">var Obj = [
  {"start": 0, "length": 3, "style": "text"},
  {"start": 4, "length": 2, "style": "operator"},
  {"start": 4, "length": 3, "style": "error"}
];</code>

Output:

Find all objects with a "start" property equal to 4. The desired result:

<code class="javascript">var result = [
  {"start": 4, "length": 2, "style": "operator"},
  {"start": 4, "length": 3, "style": "error"}
];</code>

Solution:

To achieve this, you can utilize the filter() function of JavaScript arrays. The filter() function takes a callback function as its argument, which is applied to each element in the array. The function returns a boolean value, indicating whether the element should be included in the new array.

In our case, we want to include all the objects that have a "start" property equal to 4. Here's how you would do it:

<code class="javascript">var result = Obj.filter(x => x.start === 4);</code>

This will create a new array called result, which contains only the objects that meet the filter criteria. In this example, the result will be:

<code class="javascript">[
  {"start": 4, "length": 2, "style": "operator"},
  {"start": 4, "length": 3, "style": "error"}
]</code>

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