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js map()

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ofroog answered on November 25, 2019 Popularity 10/10 Helpfulness 2/10

answer js map()

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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] */

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript

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Contributed on Feb 08 2022

ofroog

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

javascript map

Comment

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

0 Answers Avg Quality 2/10

javascript map

Comment

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

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

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Oct 04 2020

hateschoollovecoding

0 Answers Avg Quality 2/10

map javascript

Comment

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]

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: developer.mozilla.org

Tags: javascript j

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Contributed on Dec 02 2020

Dev Inca

0 Answers Avg Quality 2/10

javascript map function

Comment

/* 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];

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: developer.mozilla.org

Tags: javascript j

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Contributed on Oct 29 2020

TigerYT

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

map method js

Comment

// Map objects are collections of key-value pairs. 
// A key in the Map may only occur once, it is unique in the Map 's collection
let map = new Map()
let keyArray = 'Array'
map.set(keyArray, [1, 2, 3, 4, 5])
map.get(keyArray) // 1, 2, 3, 4, 5

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jul 29 2022

Agreeable Ape

0 Answers Avg Quality 2/10

javascript map

Comment

// 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);

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Feb 18 2021

TechNyquist

0 Answers Avg Quality 2/10

javascript map

Comment

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

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jan 03 2022

Ariful Islam Adil(Code Lover)

0 Answers Avg Quality 2/10

map javascript

Comment

//forEach vs. Map High Order Array Methods
const arr = [1,2,3]
const arr2 = [...arr,4,5]//see spread operator grepper answer for [...arr]
//the forEach doesn't return anything, it just loops through the array
arr2.forEach(function(item) {
  console.log(item + ' of ' + arr2.length)
})
//map allows us to return an array and store it into a new array
const arr3 = arr2.map(function(item) {
  //after performing some operation on all the objects of the array
  //we can then return all those values into a new array
  return item * 2
})

console.log(arr3)

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: developer.mozilla.org

Tags: javascript j

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Contributed on Oct 10 2022

Jeremy L

0 Answers Avg Quality 2/10

js map()

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