🗺️ Training — Map

📚 20 questions⏱ 15-20 min🏆 Instant feedback

🗺️ Map Object JavaScript

using object (Map) data

🎯 What You Will Learn in This Training

This interactive training will help you master Map Object JavaScript No :

✅ Ali type , input string , No
✅ Map Object
✅ Map: set, get, has, delete, clear
✅ property size repetition elements Map
✅ operator Map
✅ Ability to retake the training to improve your level and reinforce concepts

❓ Map Object?

Map object JavaScript -value (key-value pairs) .

can be used value ( object value ) value.

// Example: Map data
let userMap = newMap();

 userMap.set('name', 'Ahmed');

 userMap.set('age', 25);

 userMap.set('isActive', true);

📦 1️⃣ Map

✅ Map :

let myMap = newMap();

✅ Map array :

let myMap = newMap([

   ['name', 'Ahmed'],

   ['age', 25],

   ['city', ' ']

 ]);

🔄 2️⃣ Map Object

// Object - string
let obj = {};

 obj[1] = 'number'; // '1'

 obj[{}] = 'object'; // '[object Object]'

// Map -
let map = newMap();
let objKey = {id: 1};

 map.set(1, 'number'); // number (number)

 map.set(objKey, 'object'); // object (object)

ObjectMap
❌ String Symbol only✅ type
⚠️✅
 (size)❌ Object.keys(obj).length✅ property size

	Object	Map
	❌ String Symbol only	✅ type
	⚠️	✅
(size)	❌ Object.keys(obj).length	✅ property size

⚙️ 3️⃣ Map

let map = newMap();

// addition string

 map.set('name', 'Ahmed');

// value
let name = map.get('name'); // Ahmed

// Check
if (map.has('name')) { // true

   console.log(' ');

 }

// string

 map.delete('name');

// Map
console.log(map.size); // 0

// elements

 map.clear();

📝 4️⃣ Using Map

💡 Map?

✔ ( string )
✔ No
✔ addition elements
✔ (size)