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›Getting started0/8

01Setup and first program 02Syntax and comments 03Printing and verbs 04Basic data types 05Constants and iota 06Operators 07Type conversion 08if, for, and switch

›Core language0/14

09Functions and errors 10defer 11Arrays and slices 12Maps 13Strings and runes 14Pointers 15Structs 16Methods and embedding 17Interfaces 18Type switches 19Error values 20Packages 21JSON 22Testing

›Go for coding rounds0/16

23Fast input/output 24Two sum 25Reverse and rotate 26Top K frequent 27Valid parentheses 28Binary search 29LRU cache 30Reverse linked list 31Detect a cycle 32Merge sorted lists 33Tree depth and BFS 34Subsets and permutations 35Dynamic programming 36Number of islands 37Merge intervals 38Sliding window

›Concurrency0/5

39Goroutines 40Channels and select 41Mutexes and races 42Context 43Concurrency patterns

›Generics and stdlib0/3

44Generics 45Iterators 46The standard library

›Web services0/2

47HTTP server, no framework 48Middleware and shutdown

›Modules and packages0/3

49Modules and the go command 50Popular packages 51Packages in code

›Databases0/2

52Postgres and database/sql 53Joins, transactions, N+1

›Practice projects0/4

54Project layouts 55Practice 1 — flat 56Practice 2 — layered 57Practice 3 — by feature

›Project 1 — URL shortener0/7

58Overview and plan 59Step 1 — Set up 60Step 2 — The store 61Step 3 — Create a link 62Step 4 — The redirect 63Step 5 — Postgres 64Step 6 — Finish it

›Project 2 — Expense tracker0/9

65Overview and plan 66Step 1 — Setup and schema 67Step 2 — Register 68Step 3 — Login and JWT 69Step 4 — Auth middleware 70Step 5 — Owner-scoped CRUD 71Step 6 — Reports 72Step 7 — Refresh tokens 73Step 8 — Tests

›Project 3 — Small shop0/8

74Overview and plan 75Step 1 — Setup and schema 76Step 2 — Roles 77Step 3 — Image upload 78Step 4 — Serving files 79Step 5 — The cart 80Step 6 — Checkout 81Step 7 — Ship it

›Production0/6

82Errors and logging 83Rate limits, CORS, headers 84Docker and deployment 85Polish and docs 86Harden and review 87Profile and ship

›Go comparisons0/5

88Goroutines vs threads 89Mutex vs channel 90Arrays vs slices 91Buffered vs unbuffered 92Go vs Java vs Python

›Interview preparation0/6

93Interview questions 94Interview — language 95Interview — concurrency 96Interview — backend design 97Interview — live coding 98Interview — checklist

Go tests·7 questions

Generics and the standard library

Type parameters, constraints, and knowing what is already written for you.

1 / 7

What does ~int mean in a constraint?

Type every example yourself. Reading code is not the same as writing it.

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