CODING EXERCISES
Small problems. Strong instincts.
Choose a language and build confidence with focused exercises, helpful tests, and explanations that teach the underlying pattern.
495051
JavaScriptintermediate
Group transactions
Group transactions by category and calculate an exact total for every category.
JavaScriptintermediate
Merge two sorted result lists
Merge two ascending arrays of numbers into one ascending array without sorting the final result and without changing either input array.
Pythonintermediate
Merge default settings safely
Merge user settings over defaults, but accept only known keys and return a new dictionary. Unknown user keys must be ignored.