Beginner Coding Challenges

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291 Challenges found

Title	Difficulty	Category	Likes	Action
Join Array with join() Use Array.join() to concatenate all elements of an array into a single string with a separator.	Easy	JavaScript	Like0	Solve
List Properties with Object.keys() Use Object.keys() to return an array of a given object's own enumerable property names.	Easy	JavaScript	Like0	Solve
Split and Join with String methods Use String.split() to divide a string into parts and String.join() to combine them back with a different separator.	Easy	Java	Like0	Solve
Sort Strings with localeCompare() Use String.localeCompare() to compare two strings for alphabetical sorting, returning -1, 0, or 1.	Easy	JavaScript	Like0	Solve
Sum of Natural Numbers Compute the sum of all natural numbers from 1 to n using the formula n × (n + 1) / 2. Covers the Gauss arithmetic series and compares O(1) vs O(n) approaches.	Easy	Math	Like0	Solve
Search with String.indexOf() Use String.indexOf() to find the position of a character or substring within a string.	Easy	Java	Like0	Solve
Convert with From Trait Implement the From trait to convert a &str into a custom Name struct.	Easy	Rust	Like0	Solve
BST Inorder Successor Find the next larger value (inorder successor) for a given value in a BST.	Easy	Tree	Like0	Solve
Deque Reverse Reverse the order of elements in a deque. Teaches the two-pointer swap technique and its application to double-ended queue reversal.	Easy	Queue	Like0	Solve
Loop with Range 0..n Use Rust's 0..n range syntax with for loop to iterate over a sequence of numbers.	Easy	Rust	Like0	Solve
Deque Rotate Rotate elements to the left by k positions (simulating deque rotation).	Easy	Queue	Like0	Solve
Pad String with padStart() Use String.padStart() to pad a string with leading characters until it reaches a target length.	Easy	JavaScript	Like0	Solve
Tree Count Leaves Collect all leaf node values from a complete binary tree. Teaches leaf detection by checking child index bounds.	Easy	Tree	Like0	Solve
Vector Size with len() and is_empty() Use len() to get the number of elements in a Vec and is_empty() to check if it's empty.	Easy	Rust	Like0	Solve
Check NaN with Number.isNaN() Use Number.isNaN() to reliably determine whether a value is NaN, unlike the global isNaN() which coerces values.	Easy	JavaScript	Like0	Solve

Showing 1-15 of 291 Challenges