Golang: Learn Go Programming Language and Go Recipes

Count word frequency in text using a map by iterating over words and incrementing counts. Use the zero value for missing keys and the comma ok idiom to check existence.

Master go error handling by stopping and deleting a docker database container, validating its id (12 or 64 chars), and executing the stop and delete sequence with robust error reporting.

Learn how to use defer to close files and flush writers, write items to a file safely, and guard against panics with recover and error handling.

Write a Go filter function that takes a predicate (int to bool) and a slice of values, returning only elements for which the predicate returns true.

Explore case insensitive comparisons in Go by using a letter struct with a Greek symbol and English name, iterating a letters slice, returning the match or an error.

Parse a ledger line into a transaction using regular expressions in Go and implement a grep-like function that returns lines containing a term.

Create a function that counts how many times each go sub command appears in a file, returning a history map of command names to counts and any error.

Compile a regular expression, scan a file line by line, extract a sub command from the regex group, and count frequencies in a map.

Learn http authentication with basic and token methods, set the authorization header, and build an http server that accepts and returns json metrics (host, time, cpu, memory)

Build a rest api in go with gorilla/mux, extract ISBN from the path, fetch the book from the database, return json responses with content-type application/json, and enforce the get method.

Explore building a Go in-memory key-value store with a gorilla router, including set, get, and list operations guarded by a read-write lock, plus client and server setup.

This solution builds a key-value server with router-based set and get handlers, uses a read-write lock, and returns JSON with key and size while offering a list endpoint.

Convert sequential Go code to concurrent by spinning daily workers, fetching daily distances, and aggregating results to speed up monthly distance calculations.

Explore timeouts in Go by using a context with timeout and a buffered channel, then select to return either the algorithm's best bid or a default bid in real-time bidding.

Tackle cpu-intensive tasks by using a fixed pool of workers and a channel to dispatch vectors, compute medians, and gracefully shut down with a wait group.

Track uploaded data on your web server with the sync/atomic package. Update the total size safely using uint64 and atomic.AddUint64, without locking, and expose metrics with the xp package.

Compute total download size in Go by calculating per-file sizes from HTTP content lengths in parallel, generate year-2020 URLs, and print the total in gigabytes (about 2.27 GB).

Use an error group to run concurrent download tasks, log the download size, increment the size atomically, then wait for all jobs and convert from n64 to int.