Sorting refers to arranging items of a list in a specific order (numerical or alphabetic). Sorting is generally used in tandem with searching.
Over the years, many sorting algorithms have been developed, and one of the fastest ones to date is Quicksort.
Quicksort uses the divide-and-conquer strategy to sort the given list of elements. This means that the algorithm breaks down the problem into subproblems until they become simple enough to solve directly.
Algorithmically this can be implemented either recursively or iteratively. However, the recursive approach is more natural for this problem.
Let’s take a look at how Quicksort works:
Let’s understand these steps further by walking through an example. Consider an array of unsorted elements
[7, -2, 4, 1, 6, 5, 0, -4, 2]. We’ll choose the last element to be the pivot. The step-by-step breakdown of the array would be as shown in the image below:
Elements that have been chosen as a pivot in one step of the algorithm have a colored outline. After partitioning, pivot elements are always in their correct positions in the array.
Arrays that have a bolded black outline represent the end of that specific recursive branch since we ended up with an array that contained only one element.
We can see the resulting sorting of this algorithm by simply going through the lowest element in each “column”.
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The compound assignment operators consist of a binary operator and the simple assignment operator.
The binary operators, work with two operands. For example a+b where + is the operator and the a, b are operands. Simple assignment operator is used to assign values to a variable(s).
It’s quite common to modify values stored in variables. To make this process a little quicker, we use compound assignment operators.
You can also check my video tutorial compound assignment operators.
Let’s consider an example. Suppose price = 5 and we want to add ten more to it.
var price = 5;
price = price + 10;
We added ten to price. Look at the repetitive price variable. We could easily use a compound += to reduce this. We do this instead.
price += 5;
Awesome. Isn’t it? What’s the value of price now? Practice and comment below. If you don’t know how to practice check these lessons.
Lets bring down the price by 5 again and display it.
We use console.log command to display what is stored in the variable. It is very help for debugging.
Debugging let’s you find errors or bugs in your code. More on this later.
price -= 5;
Lets multiply price and show it.
and finally we will divide it.
If you have any doubts, comment below.