How does 'let' differ from 'var' in terms of scope?
A). 'let' is function-scoped, 'var' is block-scoped
B). Both 'let' and 'var' are block-scoped
C). 'let' is block-scoped, 'var' is function-scoped
D). Both 'let' and 'var' are function-scoped
What happens when you redeclare a variable with 'var' inside a function?
A). The variable is overwritten
B). The variable declaration is ignored
C). It throws an error
D). The function's scope is reset
Can you redeclare a 'let' variable in the same scope in JavaScript?
A). Yes
B). No
C). Only in strict mode
D). Only in non-strict mode
Which of the following is a characteristic of 'const' variables?
A). They can be redeclared
B). They can be reassigned
C). They cannot be redeclared but can be reassigned
D). They cannot be redeclared or reassigned
Why is it recommended to use 'let' and 'const' over 'var' in modern JavaScript?
A). 'let' and 'const' are function-scoped
B). 'let' and 'const' prevent variable hoisting
C). 'let' and 'const' are block-scoped, reducing potential errors
D). 'let' and 'const' are faster
Can you redeclare a 'var' variable in a different scope without error?
A). Yes
B). No
C). Only in strict mode
D). Only if the variable is not initialized
Which of the following statements about 'let' and 'const' is false?
A). Both 'let' and 'const' are block-scoped
B). Both 'let' and 'const' cannot be redeclared in the same scope
C). 'let' can be reassigned, 'const' cannot
D). Both 'let' and 'const' can be redeclared in different scopes
In which scenario would redeclaring a variable with 'var' lead to an unintended consequence?
A). When redeclaring in the same scope
B). When redeclaring in a different scope
C). When using 'strict mode'
D). When the variable has not been initialized
Which of the following correctly describes variable hoisting with 'var'?
A). 'var' declarations are not hoisted
B). Only the variable declaration is hoisted, not the initialization
C). Both declaration and initialization are hoisted
D). Only in strict mode 'var' declarations are hoisted
What does 'TDZ' stand for in the context of JavaScript?
A). Temporary Declaration Zone
B). Temporal Dead Zone
C). Temporary Dead Zone
D). Temporal Declaration Zone