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flatMap() method

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Shibu Sarkar answered on May 6, 2021 Popularity 10/10 Helpfulness 3/10

answer flatMap() method

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flatMap() method

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const arr1 = [1, 2, 3, 4, 5];

const newArr1 = arr1.flatMap((x) => [x ** 2]);
console.log(newArr1); // [ 1, 2, 3, 4, 5 ]

// can also be done as
const intermediate = arr1.map((x) => [x ** 2]);
console.log(intermediate); // [ [ 1 ], [ 4 ], [ 9 ], [ 16 ], [ 25 ] ]

const newArr2 = intermediate.flat();
console.log(newArr2); // [ 1, 4, 9, 16, 25 ]

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

// remove odd and split even element to two half elements
function func(n) {
  if (n % 2 === 0) {
    return [n / 2, n / 2];
  } else {
    return [];
  }
}
const newArr3 = numbers.flatMap(func);
console.log(newArr3); // [ 1, 1, 2, 2, 3, 3 ]

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: www.programiz.com

Tags: javascript

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Contributed on May 06 2022

Shibu Sarkar

0 Answers Avg Quality 2/10

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flatmap javascript

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var arr = [1, 2, 3, 4];

arr.flatMap(x => [x, x * 2]);
// is equivalent to
arr.reduce((acc, x) => acc.concat([x, x * 2]), []);
// [1, 2, 2, 4, 3, 6, 4, 8]

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: developer.mozilla.org

Tags: flatmap

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Contributed on May 06 2021

Powerful Porpoise

0 Answers Avg Quality 2/10

flatMap

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const arr4 = [1, 2, [3, [4, 5, [6, 7]]]] ;

console.log(arr4.flatMap((element) => element).flat(2)) ;

// expected output 
[1, 2, 3, 4, 5, 6, 7]

Popularity 10/10 Helpfulness 3/10 Language whatever

Source: www.freecodecamp.org

Tags: flatmap

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Contributed on Nov 01 2022

Tahir Tahirli

0 Answers Avg Quality 2/10

flatMap js

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let arr1 = [1, 2, 3, 4];

arr1.map(x => [x * 2]);
// [[2], [4], [6], [8]]

arr1.flatMap(x => [x * 2]);
// [2, 4, 6, 8]

// выравнивается только один уровень
arr1.flatMap(x => [[x * 2]]);
// [[2], [4], [6], [8]]

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: developer.mozilla.org

Tags: flatmap

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Contributed on Oct 15 2022

Lucky Lark

0 Answers Avg Quality 2/10

flatmap

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

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

//  See below for a more brighter explanation
//--------------------------------------------
// using 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]

//using flatmap
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]

// It is a sexier solution

Popularity 9/10 Helpfulness 1/10 Language whatever

Source: Grepper

Tags: flatmap

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Contributed on Sep 15 2023

L'homme habile

0 Answers Avg Quality 2/10

flatMap example

Comment

private void flatMapVsConcatMap() throws InterruptedException {
    Observable.just(5, 2, 4, 1)
            .flatMap(
                    second ->
                            Observable.just("Emit delayed with " + second + " second")
                                    .delay(second, TimeUnit.SECONDS)
            )
            .subscribe(
                    System.out::println,
                    Throwable::printStackTrace
            );

    Thread.sleep(15_000);
}

Popularity 10/10 Helpfulness 1/10 Language java

Source: stackoverflow.com

Tags: flatmap

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Contributed on Dec 29 2022

Deepika Sahu

0 Answers Avg Quality 2/10

flatMap() method

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