In general, array is mutable and linear collection of same data type elements. Fold is also termed as reduce, accumulate, aggregate, compress, or inject The difference between the orders lies in which elements of an array are contiguous in memory.
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To allow the transform to be reversed, one additional step is necessary
Insertion sort is a simple sorting algorithm that builds the final sorted array (or list) one item at a time by comparisons
It is much less efficient on large lists than more advanced algorithms such as quicksort, heapsort, or merge sort However, insertion sort provides several advantages