Add RadixSort

src/algorithms/sorting/radixSort.js

@@ -0,0 +1,66 @@
+var testArray = [ 331, 454, 230, 34, 343, 45, 59, 453, 345, 231, 9 ];
+
+  function radixBucketSort (arr) {
+    var idx1, idx2, idx3, len1, len2, radix, radixKey;
+    var radices = {}, buckets = {}, num, curr;
+    var currLen, radixStr, currBucket;
+
+    len1 = arr.length;
+    len2 = 10;  // radix sort uses ten buckets
+
+    // find the relevant radices to process for efficiency        
+    for (idx1 = 0;idx1 < len1;idx1++) {
+      radices[arr[idx1].toString().length] = 0;
+    }
+
+    // loop for each radix. For each radix we put all the items
+    // in buckets, and then pull them out of the buckets.
+    for (radix in radices) {          
+      // put each array item in a bucket based on its radix value
+      len1 = arr.length;
+      for (idx1 = 0;idx1 < len1;idx1++) {
+        curr = arr[idx1];
+        // item length is used to find its current radix value
+        currLen = curr.toString().length;
+        // only put the item in a radix bucket if the item
+        // key is as long as the radix
+        if (currLen >= radix) {
+          // radix starts from beginning of key, so need to
+          // adjust to get redix values from start of stringified key
+          radixKey = curr.toString()[currLen - radix];
+          // create the bucket if it does not already exist
+          if (!buckets.hasOwnProperty(radixKey)) {
+            buckets[radixKey] = [];
+          }
+          // put the array value in the bucket
+          buckets[radixKey].push(curr);          
+        } else {
+          if (!buckets.hasOwnProperty('0')) {
+            buckets['0'] = [];
+          }
+          buckets['0'].push(curr);          
+        }
+      }
+      // for current radix, items are in buckets, now put them
+      // back in the array based on their buckets
+      // this index moves us through the array as we insert items
+      idx1 = 0;
+      // go through all the buckets
+      for (idx2 = 0;idx2 < len2;idx2++) {
+        // only process buckets with items
+        if (buckets[idx2] != null) {
+          currBucket = buckets[idx2];
+          // insert all bucket items into array
+          len1 = currBucket.length;
+          for (idx3 = 0;idx3 < len1;idx3++) {
+            arr[idx1++] = currBucket[idx3];
+          }
+        }
+      }
+      buckets = {};
+    }
+  }
+  radixBucketSort(testArray);
+  console.dir(testArray);    
+
+//Refernce : https://stackoverflow.com/questions/36513414/javascript-radix-sort