Delete an element from a Map in JavaScript

You can use the delete() method to remove an element from a Map object. The delete() method removes the specified element from the map by its key name. It returns true if the Map object contained the element and was removed or false if the element does not exist.

const map = new Map([
  ['name', 'Alex Hales'],
  ['age', 27],
  ['country', 'United States']
])

console.log(map)
// Map(3) {
//   'name' => 'Alex Hales',
//   'age' => 27,
//   'country' => 'United States'
// }

console.log(map.delete('name')) // true
console.log(map.delete('name')) // false -> already removed
console.log(map.delete('job')) // false -> Not found

To delete all elements in the Map object, you can use the clear() method:

const map = new Map([
  ['name', 'Alex Hales'],
  ['age', 27],
  ['country', 'United States']
])

map.clear()

console.log(map.size) // 0
console.log(map) // Map(0) {}

Read this article to learn more about the Map object and how to create collections of key-value pairs in JavaScript.

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