JavaScript: Map: delete: Delete an entry from map

Map.prototype.delete(key)

Removes the mapping for the specified key from this map if present. This method returns true, if the element exists in the map and removed, else false.

HelloWorld.js

function printMap(map){
  console.log("***************************");
  console.log("Total elements in countriesMap are : " + map.size);
  for (var [country, capital] of map) {
    console.log(country + ' : ' + capital);
  }
  console.log("***************************");
}

var countriesMap = new Map();

countriesMap.set("Bahrain", "Manama");
countriesMap.set("Cameroon", "Yaounde");
countriesMap.set("Norway", "Oslo");
countriesMap.set("India", "New Delhi");
countriesMap.set("Russia", "Moscow");
countriesMap.set("Spain", "Madrid");

printMap(countriesMap);

console.log("\nDeleting the keys 'Spain', 'Cameroon', 'India'\n");

countriesMap.delete("Spain");
countriesMap.delete("Cameroon");
countriesMap.delete("India");

printMap(countriesMap);

Output

***************************

Total elements in countriesMap are : 6

Bahrain : Manama

Cameroon : Yaounde

Norway : Oslo

India : New Delhi

Russia : Moscow

Spain : Madrid

***************************

Deleting the keys 'Spain', 'Cameroon', 'India'

***************************

Total elements in countriesMap are : 3

Bahrain : Manama

Norway : Oslo

Russia : Moscow

***************************

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