Example A:
function mergeAndSort(array){
if (array.length > 1){
let middle = parseInt(array.length/2);
let leftArr = array.slice(0, middle);
let rightArr = array.slice(middle);
mergeAndSort(leftArr);
mergeAndSort(rightArr);
return merge(leftArr, rightArr);
}
else
return array;
}
Example B:
function mergeAndSort(arr){
if (arr.length > 1){
let mid = parseInt(arr.length/2);
let firstHalf = mergeAndSort(arr.slice(0,mid));
let secondHalf = mergeAndSort(arr.slice(mid));
return merge(firstHalf, secondHalf);
}
else
return arr;
}
Merge function:
function merging(leftArray, rightArray){
let leftIndex = 0, rightIndex = 0;
const mergedResult = [];
while (leftIndex < leftArray.length && rightIndex < rightArray.length){
if (leftArray[leftIndex] < rightArray[rightIndex]){
mergedResult.push(leftArray[leftIndex++]);
}
else{
mergedResult.push(rightArray[rightIndex++]);
}
}
let result = [...mergedResult, ...leftArray.slice(leftIndex), ...rightArray.slice(rightIndex)];
return result;
}
The output is correct for Example B but not for Example A. Can you identify the key difference between both examples?
let data = [5, 3, 7, 2, 9, 12, 4];
Executing Example A on the provided dataset results in [2, 5, 3, 7, 9, 12, 4], which is incorrect.