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Answers for "js map functions"

Whatever
46

javascript map function

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 }; });
Posted by: Guest on October-01-2020
4

javascript map array

const sweetArray = [2, 3, 4, 5, 35]
const sweeterArray = sweetArray.map(sweetItem => {
    return sweetItem * 2
})

console.log(sweeterArray)
Posted by: Guest on May-29-2020
1

javascript map

// 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 newArray = unchangedArray.map((item, index) => item);
Posted by: Guest on February-18-2021
3

functions in map javascript

const map = new Map();

function foo() {
 return "Hello World!"; 
}

map.set("foo", foo);

console.log(map.get("foo")()); // Output: "Hello World!
Posted by: Guest on May-13-2020
0

map javascript

var miMapa = new Map();

var claveObj = {},
    claveFunc = function () {},
    claveCadena = "una cadena";

// asignando valores
miMapa.set(claveCadena, "valor asociado con 'una cadena'");
miMapa.set(claveObj, "valor asociado con claveObj");
miMapa.set(claveFunc, "valor asociado with claveFunc");

miMapa.size; // 3

// obteniendo los valores
miMapa.get(claveCadena);    // "valor asociado con 'una cadena'"
miMapa.get(claveObj);       // "valor asociado con claveObj"
miMapa.get(claveFunc);      // "valor asociado con claveFunc"

miMapa.get("una cadena");   // ""valor asociado con 'una cadena'"
                         // porque claveCadena === 'una cadena'
miMapa.get({});           // undefined, porque claveObj !== {}
miMapa.get(function() {}) // undefined, porque claveFunc !== function () {}

var myMap = new Map();
myMap.set("bar", "foo");

myMap.delete("bar"); // Retorna true. Eliminado con éxito.
myMap.has("bar");    // Retorna false. El elemento "bar" ya no está presente.
Posted by: Guest on February-11-2021

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