Lets get right to it, this is my Code:
function mergeSort(unsortedArray, sortingParameter) {
if (unsortedArray.length <= 1) {
return unsortedArray;
}
const middle = Math.floor(unsortedArray.length / 2);
const left = unsortedArray.slice(0, middle);
const right = unsortedArray.slice(middle);
// Using recursion to combine the left and right
return merge(mergeSort(left), mergeSort(right), sortingParameter);
}
function merge(left, right, sortingParameter) {
let resultArray = [],
leftIndex = 0,
rightIndex = 0;
if (sortingParameter) {
console.log(left[2][sortingParameter], "parameterCheck");
while (leftIndex < left.length && rightIndex < right.length) {
console.log("while");
if (
left[leftIndex][sortingParameter] < right[rightIndex][sortingParameter]
) {
resultArray.push(left[leftIndex]);
leftIndex++;
} else {
resultArray.push(right[rightIndex]);
rightIndex++;
}
}
} else {
while (leftIndex < left.length && rightIndex < right.length) {
if (left[leftIndex] < right[rightIndex]) {
resultArray.push(left[leftIndex]);
leftIndex++;
} else {
resultArray.push(right[rightIndex]);
rightIndex++;
}
}
}
return resultArray
.concat(left.slice(leftIndex))
.concat(right.slice(rightIndex));
}
export { mergeSort };
I am new to algorithms so I am not sure it's not an obvious error, but I am trying to sort a comments Object structured like this
{
likeCount: integer,
prop: "moreStuff"
}
By the integer value stored at the likeCount key... when I put in an Array of Integers without a sorting parameter this function works just fine for example
[9,5,7,3,1] => [1,3,5,7,9]
This is a big headache for me thank you for the help in advance!!!
You forgot to pass the sortingParameter in recursive call of mergeSort, see snippet
function mergeSort(unsortedArray, sortingParameter) { if (unsortedArray.length <= 1) { return unsortedArray; } const middle = Math.floor(unsortedArray.length / 2); const left = unsortedArray.slice(0, middle); const right = unsortedArray.slice(middle); // Using recursion to combine the left and right return merge(mergeSort(left, sortingParameter), mergeSort(right, sortingParameter), sortingParameter); } function merge(left, right, sortingParameter) { let resultArray = [], leftIndex = 0, rightIndex = 0; if (sortingParameter) { while (leftIndex < left.length && rightIndex < right.length) { if (left[leftIndex][sortingParameter] < right[rightIndex][sortingParameter]) { resultArray.push(left[leftIndex]); leftIndex++; } else { resultArray.push(right[rightIndex]); rightIndex++; } } } else { while (leftIndex < left.length && rightIndex < right.length) { if (left[leftIndex] < right[rightIndex]) { resultArray.push(left[leftIndex]); leftIndex++; } else { resultArray.push(right[rightIndex]); rightIndex++; } } } return resultArray.concat(left.slice(leftIndex)).concat(right.slice(rightIndex)); } console.log(mergeSort([{ count: 4, val: "A" }, { count: 7, val: "B" }, { count: 9, val: "C" }, { count: 12, val: "D" }, { count: 3, val: "E" }, { count: 6, val: "F" }, { count: 7, val: "G" }, { count: 5, val: "H" }], "count"));
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