maps
The Map object holds key-value pairs and remembers the original insertion order of the keys. Any value (both objects and primitive values) may be used as either a key or a value.
The Map object holds key-value pairs and remembers the original insertion order of the keys. Any value (both objects and primitive values) may be used as either a key or a value.
const store = new Map([
["Hat", 20],
["Shirt", 50],
["Jeans", 70],
]);
store.get("Shirt"); // gets the value of the shirt
store.set("Ring", 300); // adds Ring key with value of 300 to store Map
store.delete("Jeans"); // deletes Jeans from store Map
store.has("Shirt"); // checks if store has Shirt, returns true
store.has("Jeans"); // checks if store has Jeans, returns false because Jeans got deleted
store.size; // checks the amount of pairs in store Map
store.forEach((value, key) => console.log(`${key} - ${value}PLN`)); //disply store Map