If I have the map object shown below:
const items = new Map([['item1','A'], ['item2','B'], ['item3', 'C']])
I am trying to retrieve the key at index 2. Is there a method other than using a for loop to accomplish this?
I managed to make it work based on the response -
Array.from(items.keys())[2]
If you need to access the key in position 2, you can use the following method:
// Define your map
var items = new Map([['item1','A'], ['item2','B'], ['item3', 'C']]);
// Accessing the key at index 2
var key = Array.from(items.keys())[2]; // This will give you 'item3'
// Obtaining the value of the item at index 2
var val1 = items.get(key); // This will return 'C'
// Alternatively...
var val2 = items.get(Array.from(items.keys())[2]); // This will also return 'C'
While maps can be sorted, they do not have an index. The only method to access the nth element is through iteration.
let mapData = new Map([['First', 'apple'], ['Second', 'banana']]);
let secondItem = [...mapData][1];
console.log(secondItem);Check out this optimized solution that efficiently retrieves the nth key from a map:
function findNthKey<K, V>(map: Map<K, V>, index: number): K | undefined {
if (index < 0) {
return undefined;
}
const iterator = map.keys();
let count = index + 1;
for (;;) {
const result = iterator.next();
if (result.done) {
return undefined;
}
if (--count === 0) {
return result.value;
}
}
}
const myMap = new Map<string, string>([['item1', 'A'], ['item2', 'B'], ['item3', 'C']]);
console.log(findNthKey(myMap, -1));
console.log(findNthKey(myMap, 0));
console.log(findNthKey(myMap, 1));
console.log(findNthKey(myMap, 2));
console.log(findNthKey(myMap, 3));
Output:
undefined
item1
item2
item3
undefined
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