Keyword

Values and Immutability

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

Keyword Lists

Learn Elixir's keyword list — an ordered list of atom-keyed tuples used heavily for options, configuration, and DSL-style function calls.

Loops in Ansible

Use the 'loop' keyword and its variants to run a single task repeatedly over lists, dictionaries, and nested data structures.

Text and Geospatial Indexes

Learn how MongoDB's text indexes power keyword search and how 2dsphere geospatial indexes enable location-based queries.

Constants (final keyword) in Java

Learn how to declare constants in Java using the final keyword, and understand its use with variables, methods, and classes.

static Keyword in Java

Learn how the static keyword creates class-level fields, methods, and blocks shared across all objects in Java.

super Keyword in Java

Learn how the Java super keyword lets a subclass access parent class fields, methods, and constructors that are shadowed or overridden.

this Keyword in Java

Master the `this` keyword in Java — resolving field/parameter name conflicts, constructor chaining, and passing the current object.

Default and Keyword Arguments in Python

How to give function parameters default values and call functions with keyword arguments, plus the notorious mutable default argument trap.

self Keyword in Python

Why self appears as the first parameter of instance methods and how it links a method call back to its object.

The this Keyword in JavaScript

Master how the value of this is determined by how a function is called, including implicit, explicit, new, and arrow-function binding rules.