Map.entries()

The Map.entries() method in JavaScript returns an iterator object that contains all key-value pairs of a Map in insertion order. Each entry is represented as an array [key, value].

Syntax

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map.entries()

Parameters

The entries() method does not take any parameters.

Return Value

The method returns a new Map Iterator object that yields key-value pairs as arrays [key, value] in insertion order.

Examples

1. Retrieving All Entries from a Map

This example demonstrates how to retrieve key-value pairs from a Map using entries().

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const map = new Map();
map.set('a', 1);
map.set('b', 2);
map.set('c', 3);

const iterator = map.entries();
console.log(iterator.next().value);
console.log(iterator.next().value);
console.log(iterator.next().value);

Output

["a", 1]
["b", 2]
["c", 3]

2. Iterating Over a Map Using entries()

The entries() method is commonly used with a for...of loop to iterate over key-value pairs in a Map.

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const map = new Map([
    ['name', 'Arjun'],
    ['age', 25],
    ['city', 'New York']
]);

for (const [key, value] of map.entries()) {
    console.log(`${key}: ${value}`);
}

Output

name: Arjun
age: 25
city: New York

3. Converting a Map to an Array

Since entries() returns an iterable, you can convert it into an array using Array.from().

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const map = new Map([
    ['x', 10],
    ['y', 20],
    ['z', 30]
]);

const entriesArray = Array.from(map.entries());
console.log(entriesArray);

Output

[
  ["x", 10],
  ["y", 20],
  ["z", 30]
]

4. Using entries() with Object.fromEntries()

The entries() method can be used with Object.fromEntries() to convert a Map into a plain JavaScript object.

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const map = new Map([
    ['id', 101],
    ['title', 'Developer'],
    ['salary', 5000]
]);

const obj = Object.fromEntries(map.entries());
console.log(obj);

Output

{
  id: 101,
  title: "Developer",
  salary: 5000
}