find the median of all keys in a map in javascript

To find the median of all keys in a map in JavaScript, you can follow these steps:

1. Get the keys of the map using the keys() method.
2. Convert the keys into an array using the spread operator (...).
3. Sort the array of keys in ascending order using the sort() method.
4. Calculate the median of the sorted array using the following formula:
   • If the array has an odd number of elements, the median is the middle element.
   • If the array has an even number of elements, the median is the average of the two middle elements.

Here's the JavaScript code to find the median of all keys in a map:

index.tsx
const myMap = new Map([[1, 'one'], [2, 'two'], [3, 'three'], [4, 'four']]);

const keysArray = [...myMap.keys()];
keysArray.sort((a, b) => a - b); // sort in ascending order

const { length } = keysArray;
const middleIndex = Math.floor(length / 2);

const median =
  length % 2 === 0
    ? (keysArray[middleIndex - 1] + keysArray[middleIndex]) / 2
    : keysArray[middleIndex];

console.log(median); // 2.5
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In this example, we first create a map with some key-value pairs. Then we convert the keys of the map to an array and sort them in ascending order. Finally, we calculate and print the median of the array of keys.