JAVASCRIPT FINAL EXAM

Which of the following is not a primitive data type in JavaScript?

• a) Number

• b) String

• c) Boolean

• d) Object

What is the output of the following code: let x = [1, 2, 3]; document.write(x[3]);

• a) 3
• b) undefined
• c) Error
• d) NaN

Which of the following is not a valid way to declare a function in JavaScript?

• a) function myFunction() {}
• b) let myFunction = function() {}
• c) function = {}

What is the output of the following code: let x = 10; function foo(){ console.log(x); } foo();

• a) 10
• b) 5
• c) Undefined
• d) Error

What is the output of the following code: let x = 2; x+=1; document.write(x);

• a) 4
• b) 2
• c) 3
• d) error

What is the correct way to declare a variable in JavaScript?

• a) let x = 5;
• b) variable x = 5;
• c)LET x = 5;

What is the output of the following code: let x = [1, 2, 3]; console.log(x.length);

• a) 1
• b) 2
• c) 3
• d) 4

What is the correct syntax for a “for” loop in JavaScript?

• a) for (let i = 0; i < 5; i++){}
• b) for (i = 0; i < 5; i++){}
• c) for (let i = 5, i > 0, i++){}
• d) for (i = 5; i > 0){}

What is the difference between “let” and “const” keywords in JavaScript?

• a) They are interchangeable
• b) “let” variables cannot be reassigned, while “const” variables can
• c) “const” variables cannot be reassigned, while “let” variables can
• d) “let” and “const” both refer to constant variables

What is the output of the following code: let x = 10; if (true) { let x = 5; } document.write(x);

• a) 10
• b) 5
• c) Undefined
• d) Error