A function bundled with references to its surrounding scope.
A closure is a function that captures variables from the lexical scope in which it was defined, retaining access to them even after that scope has finished executing. Closures are central to JavaScript patterns like callbacks, module privacy, and currying.
The ability for one interface to work with many types.
FunctionA reusable, named block of code that performs a task.
VariableA named container that stores a value in a program.
FrameworkA reusable foundation that structures how you build software.
BooleanA data type with two possible values: true or false.
EncapsulationBundling data with the methods that operate on it.