Radix sort in Javascript?

The radix sort algorithm distributes integers into buckets based on a number's significant digit or value (the radix). The radix is based on the number system of the values of the arrays. Let us look at how it can be implemented −

Example

function radixSort(arr) {
   // Find the max number and multiply it by 10 to get a number
   // with no. of digits of max + 1
   const maxNum = Math.max(...arr) * 10;
   let divisor = 10;
   while (divisor < maxNum) {
      // Create bucket arrays for each of 0-9
      let buckets = [...Array(10)].map(() => []);
      // For each number, get the current significant digit and put it in the respective bucket
      for (let num of arr) {
         buckets[Math.floor((num % divisor) / (divisor / 10))].push(num);
      }
      // Reconstruct the array by concatinating all sub arrays
      arr = [].concat.apply([], buckets);
      // Move to the next significant digit
      divisor *= 10;
   }
   return arr;
}
console.log(radixSort([5,3,88,235,65,23,4632,234]))

Output

[ 3, 5, 23, 65, 88, 234, 235, 4632 ]

Ayush Gupta

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Updated on: 16-Sep-2019

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