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Sort algorithms written in JS
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var R = require("ramda"); | |
function getRandomInt(min, max) { | |
return Math.floor(Math.random() * (max - min + 1)) + min; | |
} | |
function generateNumberList(size) { | |
return R.map(i => getRandomInt(0, size), R.range(0, size)); | |
} | |
var list = generateNumberList(1000); | |
var quickSortCount = 0; | |
var insertionSortCount = 0; | |
var mergeSortCount = 0; | |
function quickSort(list) { | |
quickSortCount++; | |
var len = R.length(list); | |
if (len == 0 || len == 1) return list; | |
var pivot = R.last(list); | |
var firstHalf = R.filter(i => i<= pivot, R.init(list)); | |
var secondHalf = R.filter(i => i> pivot, R.init(list)); | |
return R.concat(quickSort(firstHalf), R.prepend(pivot, quickSort(secondHalf))); | |
} | |
function insert(val, result) { | |
insertionSortCount++; | |
var head = R.head(result); | |
var len = R.length(result); | |
if (len > 0 && val > head) { | |
result = R.insert(0, head, insert(val, R.tail(result))); | |
} else { | |
result = R.insert(0, val, result); | |
} | |
return result; | |
}; | |
function insertionSort(input) { | |
insertionSortCount++; | |
var len = R.length(input); | |
if (len == 0 || len == 1) return input; | |
return insert(R.head(input), insertionSort(R.tail(input))); | |
} | |
function merge(a, b) { | |
mergeSortCount++; | |
if (R.length(a) == 0) return b; | |
if (R.length(b) == 0) return a; | |
var headA = R.head(a); | |
var headB = R.head(b); | |
var tailA = R.tail(a); | |
var tailB = R.tail(b); | |
return headA <= headB ? | |
R.insert(0, headA, merge(tailA, b)) : | |
R.insert(0, headB, merge(a, tailB)); | |
} | |
function mergeSort(list) { | |
mergeSortCount++; | |
var len = R.length(list); | |
if (len == 0 || len == 1) return list; | |
var firstHalf = R.slice(0, len/2, list); | |
var secondHalf = R.slice(len/2, len, list); | |
return merge(mergeSort(firstHalf), mergeSort(secondHalf)); | |
} | |
quickSort(list); | |
//insertionSort(list); | |
//mergeSort(list); | |
console.log("Array lenght: " + R.length(list)); | |
console.log("Function calls:"); | |
console.log("INSERTION SORT:", insertionSortCount); | |
console.log("MERGE SORT:", mergeSortCount); | |
console.log("QUICK SORT:", quickSortCount); |
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http://bigocheatsheet.com/ | |
Avarage | |
INSERTION SORT: O(n^2) | |
MERGE SORT: O(n log(n)) | |
QUICK SORT: O(n log(n)) | |
Array lenght: 1000000 | |
Function calls: | |
INSERTION SORT: RangeError: Maximum call stack size exceeded | |
MERGE SORT: RangeError: Maximum call stack size exceeded | |
QUICK SORT: 1354895 | |
Array lenght: 1000 | |
Function calls: | |
INSERTION SORT: 249612 | |
MERGE SORT: 11726 | |
QUICK SORT: 1353 | |
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var R = require("ramda"); | |
function insert(val, result) { | |
var head = R.head(result); | |
var len = R.length(result); | |
if (len > 0 && val > head) { | |
result = R.insert(0, head, insert(val, R.tail(result))); | |
} else { | |
result = R.insert(0, val, result); | |
} | |
return result; | |
}; | |
function insertionSort(input) { | |
var len = R.length(input); | |
if (len == 0 || len == 1) return input; | |
return insert(R.head(input), insertionSort(R.tail(input))); | |
} | |
console.log('INSERTION SORT:', insertionSort([1, 9, 3, 10, 5, 4, 6, 7, 8, 2])); |
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var R = require("ramda"); | |
function merge(a, b) { | |
if (R.length(a) == 0) return b; | |
if (R.length(b) == 0) return a; | |
var headA = R.head(a); | |
var headB = R.head(b); | |
var tailA = R.tail(a); | |
var tailB = R.tail(b); | |
return headA <= headB ? | |
R.insert(0, headA, merge(tailA, b)) : | |
R.insert(0, headB, merge(a, tailB)); | |
} | |
function mergeSort(list) { | |
var len = R.length(list); | |
if (len == 0 || len == 1) return list; | |
var firstHalf = R.slice(0, len/2, list); | |
var secondHalf = R.slice(len/2, len, list); | |
return merge(mergeSort(firstHalf), mergeSort(secondHalf)); | |
} | |
console.log('MERGE SORT:', mergeSort([1, 9, 3, 10, 5, 4, 6, 7, 8, 2])); |
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var R = require("ramda"); | |
function quickSort(list) { | |
var len = R.length(list); | |
if (len == 0 || len == 1) return list; | |
var pivot = R.last(list); | |
var firstHalf = R.filter(i => i<= pivot, R.init(list)); | |
var secondHalf = R.filter(i => i> pivot, R.init(list)); | |
return R.concat(quickSort(firstHalf), R.prepend(pivot, quickSort(secondHalf))); | |
} | |
console.log('QUICK SORT:', quickSort([1, 9, 3, 10, 5, 4, 6, 7, 8, 2])); |
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