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JavaScript Array map()

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naly moslih answered on November 25, 2019 Popularity 10/10 Helpfulness 3/10

answer JavaScript Array map()

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JavaScript Array map()

Comment

const numbers1 = [45, 4, 9, 16, 25];
const numbers2 = numbers1.map(myFunction);

function myFunction(value, index, array) {
  return value * 2;
}

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript

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Contributed on May 22 2022

naly moslih

0 Answers Avg Quality 2/10

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array map javascript

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

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

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

Popularity 10/10 Helpfulness 4/10 Language javascript

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Tags: array-map arra

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Contributed on Nov 25 2019

Calm Cockroach

0 Answers Avg Quality 2/10

array map

Comment

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

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

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

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Contributed on Dec 22 2019

Zealous Zebra

0 Answers Avg Quality 2/10

array map

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let numbers = [1, 2, 3, 4]
let filteredNumbers = numbers.map(function(_, index) {
  if (index < 3) {
     return num
  }
})
// index goes from 0, so the filterNumbers are 1,2,3 and undefined.
// filteredNumbers is [1, 2, 3, undefined]
// numbers is still [1, 2, 3, 4]

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Source: developer.mozilla.org

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Contributed on Apr 24 2021

Cute Cowfish

0 Answers Avg Quality 2/10

array.map

Comment

var x = [1,2,3,4].map( function(item) {return item * 10;});

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: search.brave.com

Tags: javascript j

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Contributed on Mar 24 2022

Outstanding Otter

0 Answers Avg Quality 2/10

array.map

Comment

let arr = [1,2,3]

/*
  map accepts a callback function, and each value of arr is passed to the 
  callback function. You define the callback function as you would a regular
  function, you're just doing it inside the map function
  
  map applies the code in the callback function to each value of arr, 
  and creates a new array based on your callback functions return values
*/
let mappedArr = arr.map(function(value){
	return value + 1
})

// mappedArr is:
> [2,3,4]

Popularity 10/10 Helpfulness 2/10 Language javascript

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Tags: javascript j

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Contributed on Jan 25 2022

QuietHumility

0 Answers Avg Quality 2/10

js map()

Comments(1)

var number = [1, 2 , 3, 4, 5, 6, 7, 8, 9]; 
var doubles  = number.map((n) => { return n*2 })

/*  doubles 
    (9) [2, 4, 6, 8, 10, 12, 14, 16, 18] */

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Contributed on Feb 08 2022

ofroog

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array.map js

Comment

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

// the array: arr = [1,2,3]
arr.map( item(value), index(where in the array), array(The array on which they run));

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: developer.mozilla.org

Tags: javascript j

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Contributed on May 01 2023

Kim Kroll

0 Answers Avg Quality 2/10

Array.map method

Comment

const shoppingList = ['Oranges', 'Cassava', 'Garri', 'Ewa', 'Dodo', 'Books']

export default function List() {
  return (
    <>
      {shoppingList.map((item, index) => {
        return (
          <ol>
            <li key={index}>{item}</li>
          </ol>
        )
      })}
    </>
  )
}

Popularity 9/10 Helpfulness 2/10 Language javascript

Source: www.freecodecamp.org

Tags: javascript j

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Contributed on Nov 05 2022

Annoying Alpaca

0 Answers Avg Quality 2/10

array.map js

Comment

Using map to reformat objects in an array

const kvArray = [
  { key: 1, value: 10 },
  { key: 2, value: 20 },
  { key: 3, value: 30 },
];

const reformattedArray = kvArray.map(({ key, value }) => ({ [key]: value }));

console.log(reformattedArray); // [{ 1: 10 }, { 2: 20 }, { 3: 30 }]
console.log(kvArray);
// [
//   { key: 1, value: 10 },
//   { key: 2, value: 20 },
//   { key: 3, value: 30 }
// ]

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Source: developer.mozilla.org

Tags: javascript j

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Contributed on May 01 2023

Kim Kroll

0 Answers Avg Quality 2/10

JavaScript Array map()

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