Convert numeric array to alphabetic array using JavaScript

Question

We need to write a JavaScript function that accepts an array of numbers. Our function should return a four-part string -

• A four-character "word" consisting of characters derived from the first two and last two numbers in in the array. The order should be read from left to right (first, second, second last, last),

• Same as above, sort the array in ascending order,

• Same as above, sort the array in descending order,

• Same as above, convert the array to ASCII characters and sort it in alphabetical order.

The four parts should form a string, with each part separated by a hyphen (-).

Example

Live demonstration

const arr = [99, 98, 97, 96, 81, 82, 82];
const transform = (arr = []) => {
   let res = [];
   res.push(arr[0], arr[1], arr[arr.length-2], arr[arr.length-1]);
   res = res.map(x=>String.fromCharCode(x)).join('');
   const arr1 = arr
   .map(el => String.fromCharCode(el))
   .sort();
   const arr2 = (arr1.slice(0, 2) + ',' + arr1.slice(-2))
   .split(',')
   .join('');
   const arr3 = arr2
   .split('')
   .reverse()
   .join('');
   return `${res}-${arr2}-${arr3}-${arr2}`;
};
console.log(transform(arr));

Output

cbRR-QRbc-cbRQ-QRbc

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