Let,Const,Var Flashcards
What keyword is used to declare a variable that can be reassigned in JavaScript?
var
True or False: ‘let’ allows variable declaration with block scope.
True
What happens if you try to reassign a variable declared with ‘const’?
It throws a TypeError.
What is the main difference between ‘let’ and ‘var’?
‘let’ has block scope, while ‘var’ has function scope.
What will be the output of ‘console.log(x)’ if ‘var x = 10;’ is declared after the log statement?
undefined
Fill in the blank: Variables declared with ‘let’ are not hoisted to the top of their block; this is known as ‘______’.
temporal dead zone
What is the scope of a variable declared with ‘let’ inside a loop?
Block scope
Can a variable declared with ‘var’ be redeclared in the same scope?
Yes
What is the output of ‘const a = 5; a = 10;’?
TypeError
Which of the following can be declared without initializing a value: ‘let’, ‘const’, or ‘var’?
‘let’ and ‘var’
What is the scope of ‘const’?
Block scope
What will happen if you declare a variable with ‘let’ and ‘var’ in the same scope?
It will cause a SyntaxError for ‘let’.
What is hoisting in JavaScript?
The behavior of moving declarations to the top of their scope.
True or False: You can use ‘let’ to create global variables.
True
What is the primary purpose of using ‘const’ in JavaScript?
To prevent reassignment of a variable.
