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Implement Heap Sort in JS
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// Testing Gist | |
var heapSort = function(arr) { | |
var n = arr.length; | |
for(var i = Math.floor(n/2) - 1; i >= 0; i--) | |
heapify(arr, n, i); | |
for(var i = n - 1; i >= 0; i--) { | |
swap(arr, 0, i); | |
heapify(arr, i, 0); | |
} | |
return arr; | |
} | |
var heapify = function(arr, n, i) { | |
var left = 2 * i + 1; | |
var right = 2 * i + 2; | |
if(left >= n && right >= n) | |
return; | |
const leftValue = (left >= n) ? Number.NEGATIVE_INFINITY : arr[left]; | |
const rightValue = (right >= n) ? Number.NEGATIVE_INFINITY : arr[right]; | |
if(arr[i] > leftValue && arr[i] > rightValue) | |
return; | |
if(leftValue > rightValue) { | |
swap(arr, i, left); | |
heapify(arr, n, left); | |
} else { | |
swap(arr, i, right); | |
heapify(arr, n, right); | |
} | |
} | |
var swap = function(arr, a, b) { | |
var temp = arr[a]; | |
arr[a] = arr[b]; | |
arr[b] = temp; | |
} | |
console.log(heapSort([14, 1, 10, 2, 3, 5, 6, 4, 7, 11, 12, 13])); | |
console.log(heapSort([])); | |
console.log(heapSort([1])); | |
console.log(heapSort([2, 1])); | |
console.log(heapSort([1,7,2,3,4,1,10,2,3,4,5])) |
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