What is a namespace in Python?
A namespace is a mapping from names to objects, and scope decides which namespace Python checks first.
- Local, enclosing, global, builtins
- LEGB lookup rule
- Avoid name collisions
What is a namespace in Python?
Tagged with scope
3 cards
Closures, lexical scope, and practical uses of closures in JavaScript
A closure happens when an inner function keeps access to variables from its lexical outer scope even after the outer function returns.
- Scope is determined lexically
- Closures retain access to outer variables
- Useful for encapsulation and factories
Closures, lexical scope, and practical uses of closures in JavaScript
Variables in JavaScript: var, let, const, scope rules, hoisting, and the temporal dead zone
Use `let` and `const` for block scope, remember that `var` is function-scoped, and know that hoisting behaves differently across them.
- `var` is function-scoped
- `let` and `const` are block-scoped
- TDZ applies before `let` and `const` initialization
Variables in JavaScript: var, let, const, scope rules, hoisting, and the temporal dead zone