Filtering with filter()

The filter() method creates a new array with elements that pass a test. It's essential for extracting subsets of data.

Basic filter() Usage

Filtering Objects

Multiple Conditions

Filter with find()

find() returns the first matching element (not an array):

Exercise: Filter Active

Exercise: Price Range

Exercise: Find by ID

Key Points

• filter() returns a new array with matching elements
• Return true to keep an element, false to exclude
• Combine conditions with && (AND) and || (OR)
• find() returns first match (not an array)
• Neither method modifies the original array