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Arrays: 01-Remove Even Integers

Arrays: 01-Remove Even Integers

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Valentine Samuel
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Are you a beginner in the world of programming and looking for ways to improve your coding skills? Well, you've come to the right place! In this blog post, we'll dive into a common problem faced by many programmers and learn how to solve it step by step. Our challenge for today is to implement a function that removes all the even elements from a given list. So, let's get started!

Problem Statement

Implement a function that removes all the even elements from a given list.

Understanding the Problem

Before we jump into coding, let's make sure we understand the problem at hand. We are tasked with writing a function that takes a list as input and removes all the even integers from it. An even number is any integer that is divisible by 2 without leaving a remainder. For instance, in the list [1, 2, 3, 4, 5, 6], the even numbers are 2, 4, and 6.

Input

my_list = [1,2,4,5,10,6,3]

Output

my_list = [1,5,3]

Approach

Option 1: Appending to a new array

To solve this problem, we will use a simple approach. We will iterate over each element in the list and check if it is even or odd. If it is odd, we will add it to the result list, and if it is even, we will skip it. In the end, we will return the result list without the even elements. I have added a simple illustration below.

Implementation: Let's write the code for our function in a popular programming language like Python:

def remove_even_numbers(lst):
    # Create an empty list to store the odd elements
    result = []

    # Iterate over each element in the given list
    for num in lst:
        # Check if the number is odd
        if num % 2 != 0:
            result.append(num)  # Add the odd number to the result list

    return result

Option 2: List comprehension

Another approach is to leverage list comprehension in Python. The idea is to create a new list containing only the odd elements from the original list in one line. This approach reduces the solution to one about a line of code.

def remove_even_numbers(lst):
    # Use list comprehension to filter odd numbers
    result = [num for num in lst if num % 2 != 0]

    return result

Conclusion

Congratulations! You've successfully solved the problem of removing even integers from a given list. By following a simple approach and implementing the code step by step, we were able to achieve our goal. Remember, as a beginner, it's essential to start with small challenges like this to strengthen your programming skills. Keep practising and exploring different problem-solving techniques, and soon you'll be able to tackle more complex tasks with confidence. I intend to write more articles on problems like this. Of course, they will increase in difficulty. You can also access my thought process on Github.

Don't forget to leave your thoughts in the comments.

Happy coding!

beginnerDSA