Map in Javascript

 const fruits = new Map();

//add new entry

fruits.set("apples", 500);

fruits.set("bananas", 300);

fruits.set("oranges", 200);

console.log(fruits)

console.log(fruits.get("apples"))//return value for key

console.log(fruits.size);//map length

//delete a key

fruits.delete("apples");

console.log(fruits)

//delete all entries

//fruits.clear();

//console.log(fruits)

//has key

console.log("has apple", fruits.has("oranges"))

//return object

console.log(typeof fruits);

//return true

console.log(fruits instanceof Map);

//loop with key value

let text = "";

fruits.forEach(function (value, key) {

text += key + ' = ' + value + ";";

})

console.log(text)

//return array [key,value] in for loop

let text1 = "";

for (const x of fruits.entries()) {

text1 += x[0] + "|" + x[1] + ";";

}

console.log(text1)

//loop over keys

let text2 = "";

for (const x of fruits.keys()) {

text2 += x + "|";

}

console.log(text2)

//loop over value

let text3 = "";

for (const x of fruits.values()) {

text3 += x + "|";

}

console.log(text3)

//undefined if key not found

console.log(fruits.get("apples"));