difference between map and flatmap in java 8

Deepika Sahu answered on July 28, 2022 Popularity 9/10 Helpfulness 1/10

answer difference between map and flatmap in java 8

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difference between map and flatmap in java 8

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Differences between Java 8 Map() Vs flatMap() :

map()	flatMap()
It processes stream of values.	It processes stream of stream of values.
It does only mapping.	It performs mapping as well as flattening.
It’s mapper function produces single value for each input value.	It’s mapper function produces multiple values for each input value.
It is a One-To-One mapping.	It is a One-To-Many mapping.
Data Transformation : From Stream to Stream	Data Transformation : From Stream<Stream to Stream
Use this method when the mapper function is producing a single value for each input value.	Use this method when the mapper function is producing multiple values for each input value.

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Contributed on Dec 15 2022

Deepika Sahu

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//map() function produces one output for one input value, whereas flatMap() function produces an arbitrary no of values as output (ie zero or more than zero) for each input value

ages.map(d => d + " age Range") //one output
//example ["<10 age Range", "10-19 age Range", "20-29 age Range", "30-39 age Range", "40-49 age Range", "50-59 age Range", "60-69 age Range", "70-79 age Range", "≥80 age Range"]

ages.flatMap(age => state.map(d => ({state:d.name, age, population: d[age]})))
/*
 0: Object {state: "AL", age: "<10", population: 598478}
  1: Object {state: "AK", age: "<10", population: 106741}
  2: Object {state: "AZ", age: "<10", population: 892083}
  3: Object {state: "AR", age: "<10", population: 392177}
  4: Object {state: "CA", age: "<10", population: 5038433}
  ....
  flatMap creates a single array instead of array of arrays when using map 
  */

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Contributed on Jul 28 2022

M M Kamalraj

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difference between map and flatmap in java 8

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// Java program using flatMap() function
import java.io.*;
import java.util.*;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
class GFG {
    public static void main(String[] args)
    {
        // making the arraylist object of List of Integer
        List<List<Integer> > number = new ArrayList<>();
       
        // adding the elements to number arraylist
        number.add(Arrays.asList(1, 2));
        number.add(Arrays.asList(3, 4));
        number.add(Arrays.asList(5, 6));
        number.add(Arrays.asList(7, 8));
       
        System.out.println("List of list-" + number);
       
        // using flatmap() to flatten this list
        List<Integer> flatList
            = number.stream()
                  .flatMap(list -> list.stream())
                  .collect(Collectors.toList());
       
        // printing the list
        System.out.println("List generate by flatMap-"
                           + flatList);
    }
}

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Contributed on Dec 15 2022

Deepika Sahu

0 Answers Avg Quality 2/10

difference between map and flatmap in java 8

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// Java program using map() function
import java.io.*;
import java.util.*;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
class GFG {
   
    public static void main(String[] args)
    {
        // making the array list object
        ArrayList<String> fruit = new ArrayList<>();
        fruit.add("Apple");
        fruit.add("mango");
        fruit.add("pineapple");
        fruit.add("kiwi");
        System.out.println("List of fruit-" + fruit);
       
        // lets use map() to convert list of fruit
        List list = fruit.stream()
                        .map(s -> s.length())
                        .collect(Collectors.toList());
        System.out.println("List generated by map-" + list);
    }
}

Popularity 9/10 Helpfulness 1/10 Language java

Source: www.geeksforgeeks.org

Tags: between

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Contributed on Dec 15 2022

Deepika Sahu

0 Answers Avg Quality 2/10

difference between map and flatmap in java 8

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