# Zhuinden/guide-to-kotlin

[GUIDE] This tutorial assumes all you know is Java, but you want to learn Kotlin.

Repository: https://github.com/Zhuinden/guide-to-kotlin
Canonical: https://ross.abutalabs.com/products/guide-to-kotlin
Homepage: https://github.com/Zhuinden/guide-to-kotlin/wiki
License: Apache-2.0
License Family: permissive
Last push: 2021-08-19T08:22:47+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 2825, "days_push": 1840, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1323, forks 96 (observed 2026-08-28T04:04:22.230741+00:00)

## What it is
A wiki-based tutorial that teaches Kotlin to developers who already know Java, covering major syntax differences and idiomatic usage. It also curates additional articles, talks, and style guides for learning Kotlin.

## Use cases
- learn Kotlin coming from Java
- understand Kotlin syntax differences from Java
- find resources for learning Kotlin
- avoid common Kotlin mistakes when converting Java code
- reference guide for Kotlin idioms

## When to choose
- you know Java and want a structured path to learn Kotlin
- you want curated articles and talks about Kotlin best practices
- you need a quick reference for Java-to-Kotlin syntax mapping

## When to avoid
- you are learning programming from scratch with no Java background
- you need an up-to-date tutorial covering the latest Kotlin features
- you want an interactive course or exercises rather than reading material

## Facets
- artifact type: learning-resource
- maturity: maintenance
- function: documentation
- domain: programming-languages, tutorials, education
- platform: jvm
- tags: kotlin, java-to-kotlin, tutorial, wiki, android-development, android

## Member repositories
- Zhuinden/guide-to-kotlin (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:22.230741+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:47:03.563555+00:00, confidence not recorded.
  - readme: https://github.com/Zhuinden/guide-to-kotlin (fetched 2026-08-28T04:04:22.230741+00:00, sha 2472a2f86390)
  - homepage: https://github.com/Zhuinden/guide-to-kotlin/wiki (fetched 2026-08-29T12:06:14.724560+00:00, sha 8cf284121beb)
- Data as of 2026-08-30T08:39:29.467469+00:00.