map javascript

Solutions on MaxInterview for map javascript by the best coders in the world

showing results for - "map javascript"
Leven
24 Sep 2016
1var numbers = [1, 4, 9];
2var doubles = numbers.map(function(num) {
3  return num * 2;
4});
5// doubles is now [2, 8, 18]. numbers still [1, 4, 9]
6
Aurélie
24 Jun 2017
1var kvArray = [["clave1", "valor1"], ["clave2", "valor2"]];
2
3// El constructor por defecto de Map para transforar un Array 2D (clave-valor) en un mapa
4var miMapa = new Map(kvArray);
5
6miMapa.get("clave1"); // devuelve "valor1"
7
8// Usando la función Array.from para transformar el mapa a un Array 2D clave-valor.
9console.log(Array.from(miMapa)); // Muestra exactamente el mismo Array que kvArray
10
11// O usando los iteradores de claves o valores y convirtiendo a array.
12console.log(Array.from(miMapa.keys())); // Muestra ["clave1", "clave2"]
13
Alessio
15 Oct 2016
1function each(collection, action) {
2  if (Array.isArray(collection)) {
3    for (var i = 0; i < collection.length; i++) {
4      action(collection[i], i, collection);
5    }
6  } else {
7    for (var key in collection) {
8      action(collection[key], key, collection);
9    }
10  }
11}
Marlene
20 Feb 2016
1var miMapa = new Map();
2
3var claveObj = {},
4    claveFunc = function () {},
5    claveCadena = "una cadena";
6
7// asignando valores
8miMapa.set(claveCadena, "valor asociado con 'una cadena'");
9miMapa.set(claveObj, "valor asociado con claveObj");
10miMapa.set(claveFunc, "valor asociado with claveFunc");
11
12miMapa.size; // 3
13
14// obteniendo los valores
15miMapa.get(claveCadena);    // "valor asociado con 'una cadena'"
16miMapa.get(claveObj);       // "valor asociado con claveObj"
17miMapa.get(claveFunc);      // "valor asociado con claveFunc"
18
19miMapa.get("una cadena");   // ""valor asociado con 'una cadena'"
20                         // porque claveCadena === 'una cadena'
21miMapa.get({});           // undefined, porque claveObj !== {}
22miMapa.get(function() {}) // undefined, porque claveFunc !== function () {}
23
24var myMap = new Map();
25myMap.set("bar", "foo");
26
27myMap.delete("bar"); // Retorna true. Eliminado con éxito.
28myMap.has("bar");    // Retorna false. El elemento "bar" ya no está presente.
Meera
17 Sep 2019
1function map(collection, action) {
2  let result = [];
3  if (Array.isArray(collection)) {
4    for (let i = 0; i < collection.length; i++) {
5      result.push(action(collection[i], i, collection));
6    }
7  }
8  else {
9    for (let key in collection) {
10      result.push(action(collection[key], key, collection));
11    }
12  } return result;
13}
14
Prince
16 Oct 2017
1miMapa.forEach(function(valor, clave) {
2  console.log(clave + ' = ' + valor);
3});
4// Mostrará 2 logs; el primero con "0 = cero" y el segundo con "1 = uno"
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