TheAlgorithms/Go is a reading tree, not a dependency

The function index is generated from doc comments, not written by hand

The package list near the top of README.md sits below the markers `<!--- AUTOGENERATED --->` and `<!--- GODOCMD BEGIN --->`, and every package becomes a collapsed details block whose entries link to source lines. So the index is a rendering of the code's own doc comments rather than a curated catalogue. Where a function carries a comment, that comment is what you get: `IsPowerOfTwoLeftShift` explains that shifting left by 1 is the same as multiplying by 2, and `GetTransition` notes that it returns `-1` when there is no transition. Where a function has none, the listing prints `No description provided`, which is what you see for `IsArmstrong` in the armstrong package and for the `Result` type in ahocorasick. The consequence for a reader is that the depth of explanation is a property of the individual file, so you have to open the source to learn whether a function was documented carefully or not at all.

go.mod is two lines and names no dependency at all

The whole dependency declaration in the repository is this:

module github.com/TheAlgorithms/Go

go 1.19

There is no require block, so nothing in the tree pulls in a third party package and every implementation is written against the Go standard library. The language line says 1.19, which sets a floor for the toolchain and is worth checking against your own go.mod before you copy a file out. The module path is the address a Go program would use to reference these packages, but there is no published version to ask for, because the tag list stops in 2021. The practical way to use this code is to read it and retype the part you need. The practical risk is that you lift a helper written against a 1.19 era standard library into a program that still compiles and then behaves differently at the edges.

ahocorasick exports the whole automaton, not just the search

Sixteen exported functions and one type in ahocorasick, against the single `IsArmstrong` in armstrong, shows that the tree mixes two different things: one function per file, and a working state machine with its internals left public. In ahocorasick you can drive the machine yourself through `ConstructTrie`, `CreateNewState`, `CreateTransition`, `GetTransition`, `StateExists`, and `GetParent`, then run the matching entry point, `AhoCorasick` for the basic automaton or `Advanced` for the extended one built by `BuildExtendedAc`. The same package also publishes its array plumbing as API: `IntArrayCapUp`, `BoolArrayCapUp`, `ArrayUnion`, `Contains`, `ComputeAlphabet`, and `GetWord`. That breadth costs a reader something. Someone who wanted one clear function finds a partial automaton, and someone who wants to reuse the automaton has to understand the transition semantics, including what `-1` means, before touching it.

The binary math files carry their own explanations and uneven ones

Inside math/binary, the doc comments carry the argument a textbook would give. `Abs` walks through taking the mask by right shifting by the base, adding the mask to the number, and XORing the result, and it records that the base is the integer width, 32 for int32 and 64 for int64. `ReverseBits` describes processing the input from its least significant bit and setting the matching high bit in the result. `FastInverseSqrt` names the magic constant 0x5f3759df, gives its decimal value 1597463007, states that the argument is assumed always positive with no handling of negative numbers, and explains that math.Float32bits and math.Float32frombits are aliases reached through unsafe.Pointer. Two spellings of one idea sit side by side in `IsPowerOfTwo` and `IsPowerOfTwoLeftShift`. The gap is `Sqrt`, which carries no description at all.

Three alpha tags from 2021, and pushes that continued for years after

The release list holds exactly three entries: v0.0.1-alpha on 2021-09-07, v0.0.2-alpha on 2021-09-08, and v0.0.3-alpha on 2021-11-09. The default branch master, which is not archived, last received a push on 2026-08-03. Read that pair of facts together rather than separately. The alpha suffix on a repository whose own description calls the code educational tells you the tags were never a compatibility promise, and the fact that nothing has been tagged since November 2021 means the version list says nothing about the code sitting in the tree right now. Pinning a tag would pin a 2021 snapshot of teaching material. For a reader, the useful move is to track the commit you actually copied, since that is the only handle that moves with the files.

A flat folder list with no cmd directory and nothing to run

The root of the default branch is a set of topical folders: cache, checksum, cipher, compression, constraints, conversion, dynamic, graph, hashing, math, other, project_euler, search, sort, sqrt, strings, and structure, sitting next to go.mod, go.sum, LICENSE, README.md, STYLE.md, CONTRIBUTING.md, .golangci.yml, and a .github directory. Two things are missing from that list. There is no cmd directory and no other entry that reads as an executable, so there is no main package to run and no binary to build. The consequence is that the only working artifacts here are individual functions and their tests, so a defect in an implementation shows up as a failing test inside one folder rather than as a program you can start, feed data, and watch misbehave.

CONTRIBUTING.md, STYLE.md, and a Gitpod workspace shape what lands here

The tree declares its own review process in the names at the root. CONTRIBUTING.md is the file the README asks you to read before contributing, STYLE.md sits beside it as a separate style document, and .golangci.yml configures Go linting. The badges point at a workflow under .github, at actions/workflows/ci.yml, and at codecov for coverage, which means tests are what the pipeline measures. For a browser editor there are .gitpod.yml and .gitpod.dockerfile, and the Gitpod badge carries the fragment `#https://github.com/TheAlgorithms/Go` in its link, which is how that button lands on this repository. What none of this can tell a reader is whether one implementation is right or fast. A green badge says checks ran on a file, not what those checks concluded about the algorithm inside it.

cache ships two eviction policies with the same method names

The cache package has a different shape again: two exported structs, `LRU` and `LFU`, two constructors, `NewLRU` and `NewLFU`, and the pair `Get` and `Put`, which the index links to the LFU file. You construct a value with a capacity and then address it by key. The type comments are the weakest prose in the tree, phrased as `Default the struct of lru cache algorithm` and `Default the struct of lfu cache algorithm`, which tells you nothing about when an entry is evicted or what `Get` returns for a key that was never inserted. The generated index documents both methods in terms of the LFU cache even though the two types share the names, so read the LRU file separately instead of assuming symmetry. There is no combined or generic cache type here, and nothing in these names promises a thread safe map.

Editorial conclusion

Use this tree when you are about to write one algorithm yourself and want a short readable Go file to read first. Do not make it a build dependency: there is no cmd directory at the top level and no tag published since 2021-11-09. Before you move a function into production code, check it against the Go standard library, read the tests in the same folder, and write your own cases for the empty input, the single element, and the signed integer edge.

Frequently asked questions

Official sources

1. License: MIT
2. Project website
3. README
4. Releases
5. TheAlgorithms/Go on GitHub