The use of Ts - Map type

Map related functions and properties:

• map.clear() – removes all key/value pairs from a Map object.
• map.set() – Set the key-value pair and return the Map object.
• map.get() – returns the value corresponding to the key, or undefined if it does not exist.
• map.has() – Returns a boolean value that determines whether the Map contains the value corresponding to the key.
• map.delete() – deletes an element in the Map, returns true if the deletion is successful, and returns false if it fails.
• map.size – Returns the number of key/value pairs in the Map object.
• map.keys() - Returns an Iterator object containing the keys of each element in the Map object.
• map.values() – Returns a new Iterator object containing the values ​​of each element in the Map object.

Iteration Map

The elements in the Map object are inserted in order, and we can iterate over the Map object, each iteration returning the [key, value] array.

TypeScript uses for...of to iterate:

// iteration in map
let keys:Iterable = map.keys();
// iterate over all keys in map
for(let key of map.keys()) {
console.log("keys",key);
}
// iterate over all values ​​in map
for(let value of map.values()){
console.log("values",value);
}
// iterate map
for(let entry of map.entries()){
console.log("entries1",entry[0], entry[1]);
    }
    for(let [key,value] of map.entries()) {
console.log("entries2",key, value);






map.forEach((value:number,key:string,map:Map)=>{
       console.log("forEach",key,value);
 p>