Let

let and Local Bindings

Learn how let and let* create local variable bindings in LISP, and how their scoping rules differ from global assignment.

Values and Immutability

How F#'s let bindings are immutable by default, how to opt into mutability, and how shadowing differs from mutation.

Fault Tolerance: Let It Crash

Explore Erlang's 'let it crash' philosophy — why defensive programming is often avoided in favor of fast failure and supervisor-driven recovery.

Fault Tolerance in Elixir

Explore how links, monitors, and the let-it-crash philosophy combine to make Elixir systems resilient by design.

Nginx and Let's Encrypt

Automate free, trusted TLS certificates for Nginx using Let's Encrypt and Certbot, including auto-renewal and HTTPS redirection.

Query Arguments and Variables

Learn how GraphQL fields accept arguments to parameterize what they return, and how variables keep queries reusable, safe, and cacheable.

let, const and Block Scope in JavaScript

How let and const introduced block scoping, the temporal dead zone, and why const does not make objects immutable.

Variables in JavaScript (var, let, const)

Learn how var, let, and const differ in scope, hoisting, and reassignment when declaring variables in JavaScript.

if let and while let in Rust

Simplify single-pattern matching in Rust using the concise if let and while let constructs.