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array map

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Cute Cowfish answered on November 25, 2019 Popularity 10/10 Helpfulness 2/10

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array map

Comment

-2

let numbers = [1, 2, 3, 4]
let filteredNumbers = numbers.map(function(num, 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]

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: developer.mozilla.org

Tags: array-map javascript

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Contributed on Apr 24 2021

Cute Cowfish

0 Answers Avg Quality 2/10

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array map javascript

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]

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: Grepper

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]

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: array-map arra

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Contributed on Dec 22 2019

Zealous Zebra

0 Answers Avg Quality 2/10

array map example

Comment

const people = [
  { firstName: 'Brian', lastName: 'Troncone' },
  { firstName: 'Todd', lastName: 'Motto' }
];
const peopleWithFullName = people.map(person => ({
  ...person,
  fullName: `${person.firstName} ${person.lastName}`
}));

// [{ firstName: 'Brian', lastName: 'Troncone', fullName: 'Brian Troncone' }, {firstName: 'Todd', lastName: 'Motto', fullName: 'Todd Motto' }]
console.log(peopleWithFullName);
 
--
 
const people = [
  { firstName: 'Brian', lastName: 'Troncone' },
  { firstName: 'Todd', lastName: 'Motto' }
];
const lastNames = people.map(person => person.lastName);

// [ 'Troncone', 'Motto' ]
console.log(lastNames);

Popularity 9/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: array-map arra

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Contributed on May 10 2023

Quaint Quelea

0 Answers Avg Quality 2/10

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 j

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Contributed on May 22 2022

naly moslih

0 Answers Avg Quality 2/10

array map

Comment

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]

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: developer.mozilla.org

Tags: array-map arra

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Contributed on Apr 24 2021

Cute Cowfish

0 Answers Avg Quality 2/10

array mdn map

Comments(1)

let new_array = arr.map(function callback( currentValue[, index[, array]]) {
    // return element for new_array
}[, thisArg])

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: developer.mozilla.org

Tags: javascript j

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Contributed on Jun 15 2020

Bad Bison

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

Source: Grepper

Tags: javascript j

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Contributed on Jan 25 2022

QuietHumility

0 Answers Avg Quality 2/10

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

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