Programming Tutorials and Coding Guides - Page 4

Use Go crypto/sha256 to hash strings and files, format SHA-256 as hexadecimal, stream large files with io.Copy, and verify known checksums.

Convert byte and []byte to integers in Go using int, strconv.Atoi, encoding/binary, varints, and big.Int, with byte order and error handling explained.

Learn how Go JSON omitempty works for zero values, pointers, slices and nested structs, how omitzero differs, and what changes with encoding/json/v2 in Go 1.27.

Learn Go for loops and for range with examples for counters, while-style loops, slices, maps, strings, integers, channels, break, continue, and modern iterators.

Convert float64 to int or int64 in Go using direct conversion or math.Round, RoundToEven, Floor and Ceil, with overflow, NaN and Inf handling.

Learn how to remove a Go module dependency, undo go get, remove Go 1.24+ tool dependencies, uninstall go install binaries, and clear the module cache.

Learn how to use os.Stat in Go to read file metadata, check whether a path exists, distinguish files and directories, handle errors, and compare Stat with Lstat.

Learn who created the Go Gopher, how Renée French's WFMU character became Go's mascot in 2009, whether it has a name, and how the artwork is licensed.

Learn structured logging in Go with Uber Zap, including Logger vs SugaredLogger, production and development loggers, fields, levels, request IDs, and configuration.

Use strings.Contains to check whether a Go string contains a substring, including case-insensitive checks, multiple values, ContainsAny, ContainsRune, and common edge cases.

Learn how to hide password input in Go using golang.org/x/term ReadPassword, detect terminals with IsTerminal, handle non-TTY input, and understand asterisk masking.

Fix Go's "go.mod file not found in current directory or any parent directory" error for existing projects, new modules, go get, workspaces, IDEs, and CI.

Learn the Go os package with practical examples for opening, creating and writing files, working with directories, file metadata, environment variables, and paths.

Fix Go's "declared and not used" and "imported and not used" compiler errors, including blank identifiers, unused return values, imports, and := shadowing.

Learn how to build a WebSocket server and client in Go using Gorilla WebSocket, send text and JSON messages, close connections, and handle common errors.

Learn how to read and parse YAML files in Go, unmarshal YAML into structs or maps, handle nested data and lists, and decode multiple YAML documents.

Learn how to use fsnotify in Go to watch files and directories, handle file events, watch one file reliably, add recursive watches, and debounce changes.

Golang Cobra tutorial with a complete go cobra example: install spf13/cobra, build subcommands, local and persistent flags, test with go run, set --version, and scaffold apps with cobra-cli.

Hexagonal architecture in Go with a Gin messaging API, GORM v2 and Valkey adapters, folder layout, inbound and outbound ports, curl verification, and when ports-and-adapters beats layered CRUD.

This tutorial covers solutions for Python Lists question from Hacker Rank using if statements, map and len() method Using the split() function

In this tutorial we cover different methods to solve python print function hackerrank solution

There are two types of polymorphism in Java: compile-time polymorphism and runtime polymorphism.

Fix IPython is not defined in Jupyter Notebook 7, JupyterLab, VS Code, and Colab by selecting the correct Matplotlib backend and kernel.

Learn how to compare two structs, slices, and maps in Go: struct equality with ==, slice and map checks with slices.Equal and maps.Equal (Go 1.21+), reflect.DeepEqual, test-focused go-cmp, and when to write your own …

Copy structs in Go: assignment copies the struct value; fields that are slices, maps, or pointers still alias shared backing data unless you duplicate them; primitives and arrays inside the struct copy by value.

Golang udp server and udp server golang with net.ListenPacket, golang udp client and go udp server patterns with DialUDP, golang send udp packet via WriteTo and Write, plus a minimal udp example for go udp and golang udp …

Step-by-step golang tcp server and golang tcp client: net.Listen and net.Dial, tcp server golang and tcp client golang patterns, deadlines and concurrent accepts with the net package.

The Java type casting is a method or process that converts a data type into another data type in both ways manually and automatically.

Learn Python shelve for persistent dict-like storage: open(), read/write, access flags, writeback, sync(), thread safety limits, security, and when to use SQLite instead.

Learn how to use Python requests for HTTPS GET and POST requests. Install requests with pip, check response.status_code, handle 200 responses, use raise_for_status(), set timeouts, and compare requests with urllib and …