JAVASCRIPT Tutorial

Filter

Concept:

Filter is a method that creates a new array containing only the elements that satisfy a specific condition.

Steps:

  1. Define a condition: Specify the criteria that elements must meet to be included in the new array.
  2. Create a callback function: Write a function that takes an individual element as input and returns true if it meets the condition, false otherwise.
  3. Invoke the filter method: Pass the callback function as an argument to filter to create a new array.

Key Points:

  • The condition can be any valid JavaScript expression.
  • The callback function is invoked for each element in the original array.
  • The filter method returns a new array and does not modify the original array.

Example:

const numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

// Create a new array containing only even numbers
const evenNumbers = numbers.filter(number => number % 2 === 0);

// Expected output: [2, 4, 6, 8, 10]

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