javascript map function

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TigerYT answered on December 22, 2019 Popularity 10/10 Helpfulness 3/10

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/* Answer to: "javascript map function" */

/*
  <Array>.map() - One of the most useful in-built methods in JavaScript (imo).

  The map() method creates a new array populated with the results of calling
  a provided function on every element in the calling array.
 
  For more information, click on the source link.

  Let me make some examples of it's uses:
*/

let array = [1, 4, 9, 16];
array.map(num => num * 2); // [2, 8, 18, 32];
array.map(pounds => `£${pounds}.00`); // ["£1.00", "£4.00", "£9.00", "£16.00"];
array.map(item => Math.sqrt(item)); // [1, 2, 3, 4];

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Source: developer.mozilla.org

Tags: javascript map-function

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Contributed on Oct 29 2020

TigerYT

0 Answers Avg Quality 2/10

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javascript map

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array.map((item) => {
  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

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Dec 22 2019

Zealous Zebra

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how to use the map method in javascript

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

const bigNumbers = numbers.map(number => {
  return number * 10;
});

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Source: www.codecademy.com

Tags: javascript j

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Contributed on Apr 08 2020

TechWhizKid

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map function in js

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const numbers = [1, 4, 9];
const roots = numbers.map((num) => Math.sqrt(num));

// roots is now     [1, 2, 3]
// numbers is still [1, 4, 9]

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Source: developer.mozilla.org

Tags: javascript j

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Contributed on Jul 08 2023

Imran Khan

0 Answers Avg Quality 2/10

how the map function works javascript

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const array = [2, 5, 9];
let squares = array.map((num) => num * num);

console.log(array); // [2, 5, 9]
console.log(squares); // [4, 25, 81]

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Contributed on Apr 07 2020

DCmax1k

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javascript map

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// make new array from edited items of another array
var newArray = unchangedArray.map(function(item, index){
  return item;	// do something to returned item
});

// same in ES6 style (IE not supported)
var newArray2 = unchangedArray.map((item, index) => item);

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Contributed on Feb 18 2021

TechNyquist

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javascript map

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const numbers = [0,1,2,3];

console.log(numbers.map((number) => {
  return number;
}));

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Contributed on Oct 04 2020

hateschoollovecoding

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javascript map

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

const anotherItems = items.map(item => item * 2);

console.log(anotherItems);

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Source: js.zonayed.me

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Contributed on Apr 14 2022

Azizul7m

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javascript map

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const numbers = [2, 4, 6, 8];
const result = numbers.map(a => a * 2);
console.log(result);
//Output: [ 4, 8, 12, 16 ]

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Contributed on Jan 03 2022

Ariful Islam Adil(Code Lover)

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javascript map

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How to use Map Function in Javascript

const map1 = new Map();

map1.set('a', 1);
map1.set('b', 2);
map1.set('c', 3);

console.log(map1.get('a'));
// Expected output: 1

map1.set('a', 97);

console.log(map1.get('a'));
// Expected output: 97

console.log(map1.size);
// Expected output: 3

map1.delete('b');

console.log(map1.size);
// Expected output: 2

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Source: Grepper

Tags: javascript j

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Contributed on Feb 23 2023

AttractivePenguin

0 Answers Avg Quality 2/10

javascript map function

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