map()

const posts = [
  { id: 1, title: "Sample Title 1", description: "Lorem ipsum dolor sit amet, consectetur adipiscing elit..." },
  { id: 2, title: "Sample Title 2", description: "Lorem ipsum dolor sit amet, consectetur adipiscing elit..." },
  { id: 3, title: "Sample Title 3", description: "Lorem ipsum dolor sit amet, consectetur adipiscing elit..." },
];
// ES2016+
// Create new array of post IDs. I.e. [1,2,3]
const postIds = posts.map((post) => post.id);
// Create new array of post objects. I.e. [{ id: 1, title: "Sample Title 1" }]
const postSummaries = posts.map((post) => ({ id: post.id, title: post.title }));

// ES2015
// Create new array of post IDs. I.e. [1,2,3]
var postIds = posts.map(function (post) { return post.id; });
// Create new array of post objects. I.e. [{ id: 1, title: "Sample Title 1" }]
var postSummaries = posts.map(function (post) { return { id: post.id, title: post.title }; });

View another examples Add Own solution

Krish 100200 points

                                    // Beispielarray
const array1 = [1, 4, 9, 16];

// &Uuml;bergebe eine Funktion an die Karte
const map1 = array1.map (x =&gt; x * 2);

console.log (map1);
// Erwartete Ausgabe: Array [2, 8, 18, 32]

Thank you! 6

4 (6 Votes)

A-312 69370 points

                                    const array1 = [1, 4, 9, 16];

// pass a function to map
const map1 = array1.map(x =&gt; x * 2);

console.log(map1);
// expected output: Array [2, 8, 18, 32]

Thank you! 7

4 (7 Votes)

Awgiedawgie 440220 points

                                    array.map((item) =&gt; {
  return item * 2
} // an example that will map through a a list of items and return a new array with the item multiplied by 2

Thank you! 3

3 (3 Votes)

Awgiedawgie 440220 points

                                    The map() method creates a new array populated with the results of calling 
a provided function on every element in the calling array.

const array1 = [1, 4, 9, 16];

// pass a function to map
const map1 = array1.map(x =&gt; x * 2);

console.log(map1);
// expected output: Array [2, 8, 18, 32]

Thank you! 3

4 (3 Votes)

Lionel Aguero 33605 points

                                    var numbers = [1, 4, 9];
var doubles = numbers.map(function(num) {
  return num * 2;
});
// doubles is now [2, 8, 18]. numbers still [1, 4, 9]

Thank you! 6

4 (6 Votes)

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