Create bucketSort.js

bucketSort.js

@@ -0,0 +1,76 @@
+function bucketsort(arr, range_min, range_max) {
+  if (arr.length <= 1) {
+    return arr;
+  }
+  if (arr.length < 20) {
+    return arr.sort();
+  }
+
+  let result = [];
+  let numberOfBuckets = Math.ceil(Math.sqrt(arr.length));
+
+  for (let i = 0; i < numberOfBuckets; i++) {
+    result.push([]);
+  }
+
+  let bucketRange = (range_max - range_min) / numberOfBuckets;
+
+  for (let i = 0; i < arr.length; i++) {
+
+    let bucketIndex = Math.floor((arr[i] - range_min) / bucketRange);
+
+    result[bucketIndex].push(arr[i]);
+  }
+
+  let finalResult = []
+  for (let i = 0; i < result.length; i++) {
+    finalResult = finalResult.concat(bucketsort(result[i], i * bucketRange + range_min, (i+1) * bucketRange + range_min));
+  }
+
+  return finalResult;
+}
+
+
+// console.log(bucketsort([0.897, 0.565, 0.656, 0.1234, 0.665, 0.3434, 0.897, 0.565, 0.656, 0.1234, 0.665, 0.3434], 0.0, 1.0));
+
+
+
+// console.log(bucketsort([1,2,3,4,5,6,7,8,9,10,11,12,13,14], 0, 15));
+
+
+// bucketRange = 0.33333
+//
+//     0.0        0.333       0.666       1.0
+//     [ [       ],  [       ],  [       ]]
+
+
+
+
+
+// calling bucketsort on large arrays compared to quicksort
+
+let test = [];
+
+for (let i = 0; i < 100000; i++) {
+  test.push(Math.random());
+}
+
+
+
+function quicksort(arr) {
+  return arr.sort((a, b) => {
+    return a - b;
+  });
+}
+
+
+console.time("quicksort: ");
+quicksort(test);
+console.timeEnd("quicksort: ");
+
+
+console.time("bucketsort: ");
+bucketsort(test, 0.0, 1.0);
+console.timeEnd("bucketsort: ");
+
+Array.sort