The Filter Method In JS

The Filter Method In JS: Hello everyone, welcome to the nkcoderz.com website. In this article we will going to discuss about the The Filter Method In JS.

Table of Contents

The filter method in JavaScript is used to create a new array that contains only elements from the original array that pass a certain test.

The filter method takes a callback function as an argument, and this callback function is executed for each element in the original array.

If the callback function returns true for a given element, that element is included in the new array. If it returns false, that element is not included.

Here’s an example of using the filter method:

const numbers = [1, 2, 3, 4, 5];
const even = number => number % 2 === 0;
const evenNumbers = numbers.filter(even);
console.log(evenNumbers);

Output

[2, 4]

In this example, we first define an array numbers with 5 elements. Then, we define an even function that takes a number and returns true if it’s even and false otherwise. Finally, we use the filter method to apply the even function to each element of the numbers array, and return a new array evenNumbers with only the even numbers.

The filter method can also be used with arrays of objects, in a similar way:

const people = [
  { name: 'John', age: 30 },
  { name: 'Jane', age: 25 },
  { name: 'Jim', age: 35 },
];

const adults = people.filter(person => person.age >= 18);

console.log(adults);

Output

[{ name: ‘John’, age: 30 }, { name: ‘Jane’, age: 25 }, { name: ‘Jim’, age: 35 }]

In this example, we define an array people with 3 elements, each representing a person with a name and an age. Then, we use the filter method to return a new array adults with only the people who are 18 years old or older.

Conclusion

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