Not Real Constants Mocktest

The let keyword is used to declare block-scoped variables in JavaScript, providing block-level

The primary difference is that const variables are immutable, meaning their value cannot be changed after initialization, while let variables are mutable and can be reassigne

The push method adds the element "yellow" to the colors array, resulting in ["red", "blue", "green", "yellow"] being logged to the console.

The const keyword in JavaScript ensures that variables cannot be reassigned to a new value or reference after initialization, making them constant in terms of their assigned value.

Declaring a const variable without initializing it immediately results in a SyntaxError because const requires initialization at the time of declaration.

The fact that const variables are not hoisted means they cannot be used before they are declared in the code, unlike var variables which are hoisted to the top of their scope.

The Object.freeze() method prevents modifications to an object's properties. Attempting to modify person.age after freezing person will result in a TypeError because the object is now immutable.

The true statement about const in JavaScript is that const variables cannot be reassigned after they are initialized with a value. They are constant in terms of their reference or value.

Using const over var in JavaScript helps prevent accidental reassignments of variables, improving code reliability and reducing the risk of unintended changes to variable values.

Attempting to reassign a value to a constant (PI in this case) will result in a TypeError since const variables cannot be reassigned after initialization.