Which of the following variable names is valid in JavaScript?
A). a. my variable
B). b. _variable
C). c. 3variable
D). d. variable$
Which of the following statements is true about the let keyword in JavaScript?
A). a. Variables declared with let have global scope
B). b. Variables declared with let are block-scoped
C). c. let is used to declare constants
D). d. let is used to declare functions
What keyword is used to declare variables in JavaScript?
A). a. var
B). b. const
C). c. let
D). d. def
Which keyword is used to declare a variable that cannot be reassigned in JavaScript?
A). a. var
B). b. let
C). c. const
D). d. mutable
What keyword is used to declare variables in JavaScript?
A). a. var
B). b. const
C). c. let
D). d. def
What will console.log(a); output if a is declared outside a function but inside a block using let in JavaScript?
A). a. It will output the value of a
B). b. It will throw an error
C). c. It will output undefined
D). d. It
Which of the following statements is true about the let keyword in JavaScript?
A). a. Variables declared with let have global scope
B). b. Variables declared with let are block-scoped
C). c. let is used to declare constants
D). d. let is used to declare functions
What will happen if you try to reassign a value to a constant declared with const in JavaScript?
A). a. It will throw an error
B). b. It will silently ignore the assignment
C). c. It will convert the variable to let
D). d. It will convert the variable to var
What is the purpose of using the const keyword in JavaScript?
A). a. To declare variables with function scope
B). b. To declare variables with block scope
C). c. To declare constants with immutable values
D). d. To declare objects in JavaScript
Which keyword is used to declare a variable that cannot be reassigned in JavaScript?
A). a. var
B). b. let
C). c. const
D). d. mutable