Day 1 Coding Challenge: Mastering String Reversal in JavaScript and Python

Welcome to Day 1 of our daily coding challenge series! Today, we’ll tackle an essential programming task: reversing a string. Whether you’re coding in JavaScript or Python, this challenge will help you sharpen your skills and enhance your understanding of string manipulation. Let’s dive in and solve this problem together!

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Introduction:

Welcome to our daily coding challenge series! Today marks the beginning of an exciting journey where we’ll solve various programming problems to improve our coding skills. Each day, we’ll present a new challenge and provide efficient solutions in both JavaScript and Python. Let’s get started with Day 1!

Problem:

Title: Reverse a String

Description:
Write a function that takes a string as input and returns the string reversed. This problem is fundamental in understanding string manipulation and will help build a solid foundation for more complex tasks.

Example:

Input: "hello"
Output: "olleh"
Input: "hello"
Output: "olleh"
Input: "hello"
Output: "olleh"

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Constraints:

• The input string will consist of printable ASCII characters.
• Do not use the built-in reverse() method.

Solution in Python:

Here’s an efficient way to reverse a string using slicing in Python:

<span>def</span> <span>reverse_string</span><span>(</span><span>s</span><span>:</span> <span>str</span><span>)</span> <span>-></span> <span>str</span><span>:</span>
    <span>return</span> <span>s</span><span>[::</span><span>-</span><span>1</span><span>]</span>
<span># Test the function </span><span>input_str</span> <span>=</span> <span>"</span><span>hello</span><span>"</span>
<span>print</span><span>(</span><span>reverse_string</span><span>(</span><span>input_str</span><span>))</span>  <span># Output: "olleh" </span>
<span>def</span> <span>reverse_string</span><span>(</span><span>s</span><span>:</span> <span>str</span><span>)</span> <span>-></span> <span>str</span><span>:</span>
    <span>return</span> <span>s</span><span>[::</span><span>-</span><span>1</span><span>]</span>

<span># Test the function </span><span>input_str</span> <span>=</span> <span>"</span><span>hello</span><span>"</span>
<span>print</span><span>(</span><span>reverse_string</span><span>(</span><span>input_str</span><span>))</span>  <span># Output: "olleh" </span>
def reverse_string(s: str) -> str:
    return s[::-1]

# Test the function input_str = "hello"
print(reverse_string(input_str))  # Output: "olleh" 

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Explanation:

1. The function reverse_string takes a string s as input.
2. The slicing notation s[::-1] is used to reverse the string. It means “start at the end of the string and end at position 0, move with the step -1” which effectively reverses the string.
3. The reversed string is returned.

Solution in JavaScript:

For JavaScript, we can reverse a string by converting it to an array, using the reverse() method, and then converting it back to a string:

<span>function</span> <span>reverseString</span><span>(</span><span>str</span><span>)</span> <span>{</span>
    <span>return</span> <span>str</span><span>.</span><span>split</span><span>(</span><span>''</span><span>).</span><span>reverse</span><span>().</span><span>join</span><span>(</span><span>''</span><span>);</span>
<span>}</span>
<span>// Test the function</span>
<span>let</span> <span>inputStr</span> <span>=</span> <span>"</span><span>hello</span><span>"</span><span>;</span>
<span>console</span><span>.</span><span>log</span><span>(</span><span>reverseString</span><span>(</span><span>inputStr</span><span>));</span>  <span>// Output: "olleh"</span>
<span>function</span> <span>reverseString</span><span>(</span><span>str</span><span>)</span> <span>{</span>
    <span>return</span> <span>str</span><span>.</span><span>split</span><span>(</span><span>''</span><span>).</span><span>reverse</span><span>().</span><span>join</span><span>(</span><span>''</span><span>);</span>
<span>}</span>

<span>// Test the function</span>
<span>let</span> <span>inputStr</span> <span>=</span> <span>"</span><span>hello</span><span>"</span><span>;</span>
<span>console</span><span>.</span><span>log</span><span>(</span><span>reverseString</span><span>(</span><span>inputStr</span><span>));</span>  <span>// Output: "olleh"</span>
function reverseString(str) {
    return str.split('').reverse().join('');
}

// Test the function
let inputStr = "hello";
console.log(reverseString(inputStr));  // Output: "olleh"

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Explanation:

1. The function reverseString takes a string str as input.
2. The split('') method converts the string into an array of characters.
3. The reverse() method reverses the order of elements in the array.
4. The join('') method joins the elements of the array back into a single string.
5. The reversed string is returned.

Your Task:

Try solving this problem on your own. Once you have a solution, share it in the comments below or tag me in your post with #CodingChallengeDay1. Feel free to discuss different approaches and optimizations!

Conclusion:

Stay tuned for tomorrow’s challenge as we continue to build our problem-solving skills. Happy coding!

By participating in these challenges, you’ll not only improve your coding abilities but also prepare yourself for coding interviews and real-world problem-solving. Let’s learn and grow together!

Feel free to leave your comments or questions below. If you found this guide helpful, please share it with your peers and follow me for more web development tutorials. Happy coding!

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原文链接：Day 1 Coding Challenge: Mastering String Reversal in JavaScript and Python