JavaScript Mastery from Zero to Hero - Prepare for Coding Interviews - The Difference Between Let and Const in JavaScrip

The video tutorial explains the use of variables in JavaScript, focusing on ES6 features like let and constant. It highlights the differences between var, let, and constant, emphasizing when to use each based on whether a variable needs to be reassignable or readonly. The tutorial aims to clarify common confusions among junior developers and encourages them to apply this knowledge in practical coding scenarios.

What is a key feature of 'const' in JavaScript?

• It is used for dynamic variables.

• It is similar to 'var' in functionality.

• It allows variable reassignment.

• It is read-only and cannot be reassigned.

Which of the following allows variable reassignment?

• 'let'

• 'var' and 'let'

• 'const'

• 'const' and 'let'

Why might you choose to use 'const' over 'let'?

• To make the variable dynamic.

• To allow the variable to be undefined.

• To allow frequent changes to the variable.

• To ensure the variable remains constant.

In what scenario is 'let' preferred over 'const'?

• When the variable should not change.

• When the variable is a function.

• When the variable needs to be reassigned.

• When the variable is a constant.

What is the main advantage of using 'const' in JavaScript?

• It prevents accidental reassignment.

• It is faster than 'let'.

• It is used for global variables.

• It allows for variable hoisting.