December 13, 2025 - function isBigEnough(value) { return value >= 10; } const filtered = [12, 5, 8, 130, 44].filter(isBigEnough); // filtered is [12, 130, 44] The following example returns all prime numbers in the array:

The filter() method creates a new array filled with elements that pass a test provided by a function.

February 15, 2024 - The filter method in JavaScript is designed as a higher-order function that iterates over each element of an array, allowing developers to apply a specific condition to filter out elements.

August 26, 2021 - An array with two values greater than 7 is returned. A common use case of filter() is with an array of objects through their properties.

The filter() method takes a callback function that defines the condition for filtering the array elements. The callback function is called for each element of the array, and elements that return true are kept, while others are excluded. ... Become a full-stack developer. Learn HTML, CSS, JavaScript, and React as well as NodeJS, Express, and SQL

March 24, 2025 - This works because many JavaScript methods return an object, enabling consecutive method calls in a seamless flow. By chaining array methods, we can efficiently perform complex transformations while keeping the code concise and readable. Before diving into chaining, let’s quickly review how these methods work individually: filter() – Narrows down the array by selecting only elements that meet a specific condition

Write a function filterRangeInPlace(arr, a, b) that gets an array arr and removes from it all values except those that are between a and b.

November 7, 2024 - The following example uses the filter() method to return an array of numbers that are greater than 2: const numbers = [1, 3, 2, 7]; const results = numbers.filter((n) => n > 2); console.log({ results });Code language: JavaScript (javascript)

Here is the function signature ... in Javascript: ... As described above, the filter() function takes two inputs. function: A valid, pre-defined function. This can also be a lambda function. array: The array on which filter function is called. Returned: An array containing elements of the original array that satisfied all the conditions of the input function. Let’s take a look at a couple of examples of how the ...

December 22, 2025 - What is filter()? A method to create a new array filled with elements that pass a test you define. How does it work? Write a function that returns true for items you want to keep, and false for those you don't. Real-world applications: From improving search functionality on websites to sorting through database results, filter() is incredibly versatile. Combine with other methods: Enhance its power by pairing filter() with map() and reduce() for more complex data handling.

November 12, 2021 - There's a subtle, but really important point here - Boolean() follows the JavaScript rules of truthiness. That means that the output Boolean() might not always be what you imagine. In this context, passing Boolean to .filter is effectively shorthand for doing this: ... I suspect that you may have seen at least one of these variations before. In the end, array.filter(Boolean) is just shorthand for any of the other options above.

July 25, 2024 - Given this function above, let’s break it apart into its components from the filter() prototype: The callback function in this code is getRecent. The currentValue is each sale in the parent array (sales). The array entries are provided in order, with each element being sent to getRecent in the parameter sale.

November 7, 2024 - In this article, you have learned how to filter an array in JavaScript using the for loop and filter() method.

Assign the new filtered array to a new variable. Here is an example that uses the filter() method to filter an array based on a search criteria for car brands that start with the letter “B.”

10; } Output: [20,30] Explanation: const newArray = filter(arr, fn); // [20, 30] The function filters out values that are not greater than 10 Example 2: Input: arr = [1,2,3], fn = function firstIndex(n, i) { return i === 0; } Output: [1] ...

March 11, 2022 - We use the JavaScript filter array function to return freelancers containing the particular skillset. Furthermore, the JavaScript filter does not mutate the string but rather creates a new one hence the original string is not affected.

The Array#filter() function in ... callback returns truthy for. For example, given an array of numbers 1-10, below is how you can use filter() to return an array of even numbers....

// create a new array by filter even numbers from the numbers array let evenNumbers = numbers.filter(checkEven); console.log(evenNumbers); // Output: [ 2, 4, 6, 8, 10 ] ... Here, arr is an array.