Coding Challenges
Welcome to the coding challenges section! Here you can find a variety of coding problems designed to test your programming skills and problem-solving abilities. Each problem will have a description, a solution, and a set of test cases to help you validate your solution.
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Reverse and capitalize every word
Write a function that takes a sentence and returns each word reversed and capitalized.
Advanced
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Reverse alternating words
Write a function that takes a sentence and reverses every other word, keeping the rest as is.
Advanced
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Reverse string in pairs of two
Write a function that takes a string and reverses it in pairs of two characters, leaving the last character if the length is odd.
Intermediate
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Reverse vowels only
Write a function that takes a string and reverses only the vowels, keeping the rest of the characters in place.
Advanced
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Reverse words in a sentence
Write a function that takes a sentence and returns the sentence with each word individually reversed, maintaining their original order.
Intermediate
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Reverse second half of string
Write a function that takes a string and returns it with only the second half reversed, while the first half remains the same.
Intermediate
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Reverse entire string
Write a function that takes a string and returns the string in reverse order.
Beginner
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Extract characters between two specific characters
Write a function that extracts and returns the substring located between two specific characters in a given string. If either character is missing, return None.
Advanced
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Extract even indexed characters
Write a function that takes a string and returns a new string containing only characters at even indices.
Intermediate
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Extract substring between two indices
Write a function that takes a string and returns a substring between the given start and end indices.
Intermediate
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Extract characters after the fifth index
Write a function that takes a string and returns all characters after the fifth index.
Beginner
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Extract first five characters
Write a function that takes a string and returns the first five characters. If the string has fewer than five characters, return the entire string.
Beginner
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Skip every other character
Write a function that takes a string and returns every other character from it.
Intermediate
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Extract middle substring
Write a function that takes a string and returns a substring from the third to seventh characters, inclusive.
Intermediate
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Get last four characters
Write a function that takes a string and returns the last four characters. If the string has fewer than four characters, return the entire string.
Beginner
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Extract first three characters
Write a function that takes a string and returns the first three characters. If the string has fewer than three characters, return the entire string.
Beginner
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Insert string in the middle
Write a function that takes two strings, a base string and an insert string, and returns the base string with the insert string added at its midpoint.
Intermediate
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Add comma to large number
Write a function that takes a list of integers and concatenates them into a single comma-separated string.
Beginner
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Concatenate and capitalize
Write a function that takes two strings and concatenates them with a space. The result should be capitalized.
Beginner
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Join file path segments
Write a function that takes a list of folder names and joins them into a single file path with a slash between each segment.
Beginner
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Repeat a word n times
Write a function that takes a word and an integer n, and returns the word repeated n times, separated by a hyphen.
Intermediate
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Concatenate list of numbers as string
Write a function that takes a list of integers and returns a single string by concatenating their string representations.
Intermediate
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Merge two sentences with a period
Write a function that takes two sentences and joins them with a period and a space.
Beginner
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Concatenate first and last names
Write a function that takes a first name and a last name, and returns the full name with a space in between.
Beginner
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Concatenate with custom separator
Write a function that joins a list of strings using a custom separator. The separator is provided as an additional argument.
Beginner
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Join words with space
Write a function that takes a list of words and joins them with a single space between each word, returning the resulting string.
Beginner
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Find unique characters in string
Write a function that takes a string and returns a string containing only its unique characters in the order they first appear.
Intermediate
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Count occurrences of each character
Write a function that takes a string and returns a dictionary with each unique character as the key and its number of occurrences as the value.
Intermediate
