create object with map javascript code example
Example 1: map through keys javascript
var myObject = { 'a': 1, 'b': 2, 'c': 3 };
Object.keys(myObject).map(function(key, index) {
myObject[key] *= 2;
});
console.log(myObject);
// => { 'a': 2, 'b': 4, 'c': 6 }
Example 2: object to map javascript
const map = new Map(Object.entries({foo: 'bar'}));
map.get('foo'); // 'bar'
Example 3: js map on object
import { map } from "ramda"
const double = x => x * 2;
const mappedObject = map(double, {x: 1, y: 2, z: 3}); //=> {x: 2, y: 4, z: 6}
Example 4: javascript map to object
Object.fromEntries(Map)
Example 5: map through keys javascript
var myObject = { 'a': 1, 'b': 2, 'c': 3 };
for (var key in myObject) {
if (myObject.hasOwnProperty(key)) {
myObject[key] *= 2;
}
}
console.log(myObject);
// { 'a': 2, 'b': 4, 'c': 6 }
Example 6: map object
let myMap = new Map()
let keyString = 'a string'
let keyObj = {}
let keyFunc = function() {}
// setting the values
myMap.set(keyString, "value associated with 'a string'")
myMap.set(keyObj, 'value associated with keyObj')
myMap.set(keyFunc, 'value associated with keyFunc')
myMap.size // 3
// getting the values
myMap.get(keyString) // "value associated with 'a string'"
myMap.get(keyObj) // "value associated with keyObj"
myMap.get(keyFunc) // "value associated with keyFunc"
myMap.get('a string') // "value associated with 'a string'"
// because keyString === 'a string'
myMap.get({}) // undefined, because keyObj !== {}
myMap.get(function() {}) // undefined, because keyFunc !== function () {}