What are some advanced JavaScript array methods I should know?

What are some advanced JavaScript array methods I should know?

Some advanced array methods include reduce(), flatMap(), and sort(). Would you like examples of how to use them?

Yes, please provide an example of reduce().

Sure! The reduce() method executes a reducer function on each element of the array, resulting in a single output value. For example:

const numbers = [1, 2, 3, 4];
const sum = numbers.reduce((accumulator, current) => accumulator + current, 0);
console.log(sum); // Output: 10

What about flatMap()? How does it work?

The flatMap() method first maps each element using a mapping function, then flattens the result into a new array. Here's an example:

const arr = [1, 2, 3];
const result = arr.flatMap(x => [x, x * 2]);
console.log(result); // Output: [1, 2, 2, 4, 3, 6]

Can you explain how sort() works with a custom comparator?

Absolutely! The sort() method sorts the elements of an array in place and can take a custom comparator function. For example:

const fruits = ['banana', 'apple', 'cherry'];
fruits.sort((a, b) => a.length - b.length);
console.log(fruits); // Output: ['apple', 'banana', 'cherry']