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mergeSort.js
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mergeSort.js
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/* eslint-disable no-param-reassign */
function merge(arrayToSort, low, middle, high) {
const helper = [arrayToSort.length];
let helperLeft = low;
let helperRight = middle + 1;
let current = low;
for (let i = low; i <= high; i++) {
helper[i] = arrayToSort[i];
}
while ((helperLeft <= middle) && (helperRight <= high)) {
if (helper[helperLeft] <= helper[helperRight]) {
arrayToSort[current] = helper[helperLeft];
helperLeft++;
} else {
arrayToSort[current] = helper[helperRight];
helperRight++;
}
current++;
}
const remaining = middle - helperLeft;
for (let j = 0; j <= remaining; j++) {
arrayToSort[current + j] = helper[helperLeft + j];
}
}
function mergeSort(arrayToSort, low, high) {
if (low < high) {
const middle = Math.floor((low + high) / 2);
mergeSort(arrayToSort, low, middle);
mergeSort(arrayToSort, middle + 1, high);
merge(arrayToSort, low, middle, high);
}
}
module.exports = mergeSort;