How is block scope affected when using var compared to let and const?
- var variables have block scope only within functions.
- var variables have function scope.
- let and const variables have block scope.
- let and const variables have global scope.
Variables declared with "var" in JavaScript have function scope, meaning they are only scoped to the function in which they are declared. On the other hand, "let" and "const" introduce block scope, meaning they are scoped to the nearest enclosing block, like loops or conditionals. This block-level scoping behavior prevents issues like variable hoisting and improves code maintainability.
Loading...
Related Quiz
- You are working on a form validation feature where you want to select all input elements within a form. Which method allows you to select all input elements within a specific form element?
- The method _______ returns the index of the first element in the array that satisfies the provided testing function.
- You are debugging a piece of code and encounter a variable declaration let [a, b, ...rest] = [10, 20, 30, 40, 50];. What will be the value of rest?
- The _______ method returns a Promise that resolves or rejects as soon as one of the promises in an iterable resolves or rejects, with the value or reason from that promise.
- Considering browser compatibility, which array method would you avoid in Internet Explorer 8?