To convert a map to an array of keys in JavaScript, you can use the keys() method to get an iterator of keys and then convert it to an array using the Array.from() method. This provides a convenient way to extract all keys from the map.
We can convert a map to an array of keys in JavaScript using the keys() method, which provides an iterator of all keys in the map. We can then convert this iterator to an array using the Array.from() method.
For example,
myMap
with some key-value pairs. In this example, the map has string keys and integer values.keys
method to get an iterator of the keys in the map.Array.from
method.keysArray
.console.log
function to verify the conversion.const myMap = new Map([
['one', 1],
['two', 2],
['three', 3]
]);
// Convert map to an array of keys
const keysArray = Array.from(myMap.keys());
// Print the keys
console.log('Keys:', keysArray);
Keys: ['one', 'two', 'three']
We can also convert an empty map to an array of keys in JavaScript using the keys() method, which returns an empty array when the map is empty.
For example,
emptyMap
with string keys and integer values.keys
method to get an iterator of the keys in the empty map.Array.from
method.emptyKeysArray
.console.log
function to verify that the array is empty.const emptyMap = new Map();
// Convert empty map to an array of keys
const emptyKeysArray = Array.from(emptyMap.keys());
// Print the keys
console.log('Keys:', emptyKeysArray);
Keys: []
We can convert a map to an array of keys in JavaScript after adding elements using the keys() method, which provides an updated iterator of all keys in the map.
For example,
dynamicMap
with string keys and integer values.set
method.keys
method to get an iterator of the keys in the map after adding elements.Array.from
method.dynamicKeysArray
.console.log
function to verify the updated list of keys.const dynamicMap = new Map();
// Add elements to the map
dynamicMap.set('one', 1);
dynamicMap.set('two', 2);
dynamicMap.set('three', 3);
// Convert map to an array of keys
const dynamicKeysArray = Array.from(dynamicMap.keys());
// Print the keys
console.log('Keys:', dynamicKeysArray);
Keys: ['one', 'two', 'three']
In this tutorial, we learned How to Convert a Map to an Array of Keys in JavaScript language with well detailed examples.