Filtering arrays based on specific conditions is fundamental for data processing, search functionality, and creating subsets of data that match user criteria in JavaScript applications. With over 25 years of experience in software development and as the creator of CoreUI, I’ve implemented array filtering extensively in components like search bars, data tables, and dashboard filters where users need to narrow down large datasets. From my extensive expertise, the most powerful and functional approach is using the filter() method, which creates a new array containing only elements that pass a test condition. This method is immutable, chainable, and provides excellent readability for complex filtering logic.