JAVASCRIPT

map dictionary javascript

var myObject = { 'a': 1, 'b': 2, 'c': 3 };

Object.keys(myObject).map(function(key, index) {
  myObject[key] *= 2;
});

// { 'a': 2, 'b': 4, 'c': 6 }

javascript map key

// ["a_1", "b_2", "c_3"]
map.map((key, value) => key + "_" + value);

js map key value

for (const [key, value] of myMap.entries()) {
  console.log(key, value);
}

javascript key value map

Shorthand: (key,value) Map 

const callbackMap = new Map<string, PushEventCallback>([
      ["addComment", addCommentCallback],
      ["commentModified", editCommentCallback]
]);

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map#:~:text=Cloning%20and%20merging%20Maps

javascript map ket to value

m.set('color', 'red')
m.set('age', 2)