Assumes you already know how to program. Choose the language you will use and jump straight to interview syntax, collections, and templates.
Python
A 16-module interview guide to Python object semantics, collections, executable templates, and eight deterministic visual traces.
Java
Collections Framework, PriorityQueue, arrays, comparators, StringBuilder, and reusable interview templates.
C++
Fast, expressive standard-library tools for candidates already comfortable with ownership and iterator details.
JavaScript / TypeScript
A familiar choice for web engineers, with a few data-structure gaps worth preparing for explicitly.
Go
Simple control flow and explicit data structures for candidates fluent in Go's standard library.
Which language should I use for interviews?#
Low ceremony · Built-in hash collections · Readable pseudocode-like solutions
Watch: Aliasing and mutation · Heap ties · Recursion depth · Accidental quadratic workExplicit types · Strong standard collections · Predictable implementation details
Watch: Comparator overflow · Primitive boxing · String equalityPowerful STL · Efficient containers · Flexible algorithms
Watch: Comparator direction · Iterator invalidation · Undefined behaviorFamiliar syntax · Fast iteration · Good object and map support
Watch: No built-in heap · Numeric sorting · Shift complexitySimple syntax · Straightforward slices and maps · Explicit implementations
Watch: Heap interface ceremony · No generic utility set in older codebases · Rune versus byte handlingUse the language in which you can implement correct solutions fastest while comfortably explaining its data structures and complexity.