Golang mutex: sync.Mutex lock and unlock with examples
Mutex in golang with sync.Mutex: Lock and Unlock, fix data races with go run -race, golang mutex lock patterns, defer unlock, sync.RWMutex for many readers, embed a mutex in a struct.
Golang global variables: package scope, exports, structs, and pitfalls
Golang global variable and golang global variables: package-level var, global variable declaration golang, golang globals and go global variables, golang global variables across packages with exported names, global …
Go map to JSON: convert, print, and parse back with encoding/json
Golang map to JSON and JSON string: json.Marshal and string(bytes) to convert map to json golang, MarshalIndent and Encoder to print map as JSON, then json.Unmarshal for json to map golang (map[string]any) with …
Gorilla mux in Go: routing, path variables, subrouters, and middleware
Gorilla mux tutorial for gorilla mux and golang gorilla mux: install github.com/gorilla/mux, gorilla mux example with Methods and path vars, subrouters, middleware with r.Use, mux gorilla naming, and gorilla mux vs gin …
Go comma ok idiom: map, type assertion, and channel receive
Golang comma ok idiom and go comma ok idiom: the second bool from v, ok := m[k], v, ok := x.(T), or v, ok := <-ch; comma ok idiom golang covers maps, type assertions, and closed channels—not the same as if err != nil.
Create a Go Module: go mod init, go.mod, and a Small Example
Learn golang create module workflow with go mod init to generate go.mod, pick a golang module name, enable modules by default, and add a nested package plus tests—without relying on GOPATH src layout.
Golang return multiple values from a function
Golang return multiple values and go function return multiple values: syntax, two-value returns, mixed types, blank identifiers, (T, error), and named results.
Golang return error: create, wrap, and check errors in Go
Golang return error and go return error: the error interface, errors.New and fmt.Errorf, if err checks, wrapping with %w, errors.Is and errors.As, and turning an error into a string.
Convert io.Reader or io.ReadCloser to a String in Go
Drain a golang io.Reader or io.ReadCloser into a string with io.ReadAll and string(b), or stream with strings.Builder and io.Copy or bytes.Buffer.ReadFrom; use strings.NewReader when you need a reader from a string.
Go Type Casting: Conversions, Assertions, and Interface to Struct
Golang cast and go cast usually mean explicit type conversion (numeric) or type assertion from any: golang type casting vs strconv for strings, safe v.(T) and golang cast interface to struct with value or pointer types.
Change the Default log Package Prefix, Flags, and Output in Go
Go import log for the standard logger: change golang log format with SetFlags, add a golang log prefix with SetPrefix or log.New, use log.Printf for formatted lines, and send output to files or MultiWriter for console …
Golang remove from slice: delete element by index and while iterating
Golang remove from slice and delete element from slice golang: by index with order, swap-pop without order, first element, and safe patterns while iterating.
Golang remove duplicates from slice: dedupe and unique values
Golang remove duplicates from slice: preserve order with a map, sort then Compact for sorted unique, counts with map, and the XOR trick for one odd-count value.
Convert a Go Byte Slice to io.Reader (and Reader Back to Bytes)
Turn a Go []byte or byte buffer into an io.Reader with bytes.NewReader, use strings.NewReader for text, then read with io.ReadAll or io.Copy when you need bytes or strings back from a reader.
Golang HTML to Text: Strip Tags, Parse HTML, and Convert HTTP Body
Convert HTML to text in Go, strip HTML tags, read HTTP response body with io.ReadAll, parse HTML with golang.org/x/net/html, extract body text or body HTML, and know when html2text or bluemonday fits better.
Golang URL Encode Decode: QueryEscape, PathEscape, and Query Params
URL encode and decode strings in Go with net/url: QueryEscape, QueryUnescape, PathEscape, PathUnescape, url.Values, ParseQuery, and url.Parse with RawQuery.
Golang Type Assertion: Interface, Concrete Type, and Type Switch Examples
Learn how type assertion works in Go on interface values: concrete types, x.(T) vs comma-ok, panic rules, type switches, and how assertion differs from type conversion.
Golang Variadic Function: ... Syntax, Varargs, and Slice Examples
Variadic functions in Go use ...T for the last parameter (varargs), behave like []T inside the body, and accept slice arguments with slice.... Compare ... at define vs call, mix fixed parameters, ...any, and common …
Golang remove backslash from string
Remove backslash from a string in Go with strings.ReplaceAll or strings.Replace, including raw literals and optional cleanup. Related: golang remove substring and golang remove characters.
JavaScript splice(): Add, Remove, and Replace Array Elements
Learn JavaScript splice() with examples to remove, add, and replace array elements, understand mutation, return values, and slice vs splice.
Replace Substring in JavaScript with replace() and replaceAll()
Replace substrings in JavaScript with replace(), replaceAll(), regex, and replacement functions—first match, all matches, and capture groups.
Remove Last Character from String in JavaScript
Learn how to remove the last character from a string in JavaScript using slice(), substring(), replace(), and Unicode-safe Array.from() examples.
JavaScript Open New Tab with window.open()
Learn how to open a new tab in JavaScript with window.open(). See _blank examples, noopener and noreferrer, popup blocker rules, same-tab alternatives, and secure browser behavior.
JavaScript Merge Objects: Spread, Object.assign, and Deep Merge
Merge objects in JavaScript: spread, Object.assign, shallow vs deep copies, overwrite order, and when structuredClone fits.
Mediator Pattern in JavaScript: Practical JS Example
Mediator pattern in JavaScript: central coordinator, reduced coupling between components, when to prefer it over Observer, and a small runnable example.
JavaScript Observer pattern (EventTarget and custom pub/sub)
Implement the Observer pattern in JavaScript with EventTarget, callback lists, Pub/Sub differences, error handling, and avoiding listener leaks.
JavaScript Singleton Pattern with Class and Module Examples
Learn the JavaScript singleton pattern with class-based singleton, module singleton, getInstance examples, and when to avoid global state.
JavaScript Mouse Events: click, dblclick, mousedown, mouseup and mouseover
JavaScript mouse events: click, dblclick, mousedown, mouseup, mouseover, mouseenter, mouseout, mouseleave, mousemove, target, and coordinates—with Node-friendly snippets where possible.
JavaScript Remove Element from DOM with remove() and removeChild()
Learn how to remove DOM elements in JavaScript using element.remove(), parentNode.removeChild(), querySelector(), event handlers, and safe null checks.
JavaScript Replace DOM Element with replaceChild() and replaceWith()
Learn how to replace DOM elements in JavaScript using replaceChild(), replaceWith(), createElement(), text replacement, and safe element checks.