How to Print a Map in JavaScript - Step by Step Examples

How to Print a Map in JavaScript ?

Answer

To print a map in JavaScript, you can iterate over the map using the forEach method, a for-of loop, or the entries method to print each key-value pair.

✐ Examples

1 Printing a Map Using forEach Method

We can print a map in JavaScript by iterating over the map using the forEach method and printing each key-value pair.

For example,

We start by declaring and initializing a map named myMap with some key-value pairs. In this example, the map has string keys and integer values.
We use the forEach method to iterate over each key-value pair in the map. The forEach method takes a callback function that defines the operation to be performed on each element.
Inside the callback function, we print the key and value of each pair using the console.log function.

JavaScript Program

const myMap = new Map([
    ['one', 1],
    ['two', 2],
    ['three', 3]
]);

// Print the map using forEach method
myMap.forEach((value, key) => {
    console.log(`${key}: ${value}`);
});

Output

one: 1
two: 2
three: 3

2 Printing a Map Using for-of Loop

We can print a map in JavaScript by iterating over the map using a for-of loop and printing each key-value pair.

For example,

We start by declaring and initializing a map named myMap with some key-value pairs. In this example, the map has string keys and integer values.
We use a for-of loop to iterate over each key-value pair in the map. The loop variable entry represents each key-value pair in the map as an array.
Inside the loop, we use array destructuring to extract the key and value from each pair and print them using the console.log function.

JavaScript Program

const myMap = new Map([
    ['one', 1],
    ['two', 2],
    ['three', 3]
]);

// Print the map using for-of loop
for (const [key, value] of myMap) {
    console.log(`${key}: ${value}`);
}

Output

one: 1
two: 2
three: 3

3 Printing a Map Using entries Method

We can print a map in JavaScript by iterating over the map using the entries method and printing each key-value pair.

For example,

We start by declaring and initializing a map named myMap with some key-value pairs. In this example, the map has string keys and integer values.
We use the entries method to get an iterator of the map's key-value pairs. The iterator returns each key-value pair as an array.
We use a for-of loop to iterate over the iterator. The loop variable entry represents each key-value pair in the map as an array.
Inside the loop, we use array destructuring to extract the key and value from each pair and print them using the console.log function.

JavaScript Program

const myMap = new Map([
    ['one', 1],
    ['two', 2],
    ['three', 3]
]);

// Print the map using entries method
for (const [key, value] of myMap.entries()) {
    console.log(`${key}: ${value}`);
}

Output

one: 1
two: 2
three: 3

Summary

In this tutorial, we learned How to Print a Map in JavaScript language with well detailed examples.

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How to Print a Map in JavaScript - Step by Step Examples