I Bet You Don’t Use These JavaScript Tricks and Practices

over 1 year ago

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Flat Map in javascript is a great technique which you can learn here. Flat map essentially conbines techniques of map and filter Array method into one. I will suggest you to use flatMap() over combination of filter() and map().

. . .

  1. Using FlatMap

FlatMap takes single pass and doesn’t produce intermediate array but filter ()and map() combination produces an intermediate array.

// using filterAndMap
console.time("filterAndMap")
const numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

const squaredOddNumbers = numbers
.filter(num => num % 2 !== 0)
.map(num => num * num)

console.log(squaredOddNumbers); // [1, 9, 25, 49, 81]
console.timeEnd("filterAndMap")
using filter and Map
console.time("filterAndMap")
const numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

const squaredOddNumbers = numbers.flatMap(num =>
num % 2 !== 0 ? [num * num] : []
);


console.log(squaredOddNumbers); // [1, 9, 25, 49, 81]
console.timeEnd("filterAndMap")

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