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73 lines
1.4 KiB
73 lines
1.4 KiB
/**
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*
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*/
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var Mergesort = function() {
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this.instructions = [];
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};
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Mergesort.prototype = Object.create(Sorter.prototype);
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/**
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*
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*/
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Mergesort.prototype.addInstruction = function(operation, left, right, mid) {
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console.log({
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operation: operation,
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left: left,
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right: right,
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mid: mid
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});
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this.instructions.push({
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operation: operation,
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left: left,
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right: right
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});
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};
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/**
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*
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*/
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Mergesort.prototype.sort = function(arr, start, end) {
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if (arr.length === 0) {
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return arr;
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}
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if (start === end) {
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this.addInstruction('single', start);
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return new Array(arr[start]);
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}
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var mid = start + Math.floor((end - start) / 2);
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var arr1 = this.sort(arr, start, mid);
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var arr2 = this.sort(arr, mid + 1, end);
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var result = this.merge(arr1, arr2);
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return result;
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};
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/**
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*
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*/
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Mergesort.prototype.merge = function(arr1, arr2) {
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var result = [];
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while (arr1.length > 0 || arr2.length > 0) {
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if (arr1.length === 0) {
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result.push(arr2.shift());
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}
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else if (arr2.length === 0) {
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result.push(arr1.shift());
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}
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else if (arr1[0].value <= arr2[0].value) {
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result.push(arr1.shift());
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}
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else {
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result.push(arr2.shift());
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}
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}
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return result;
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};
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