Question

Which of these values are falsy?

0;
new Number(0);
('');
(' ');
new Boolean(false);
undefined;

• A: 0, '', undefined
• B: 0, new Number(0), '', new Boolean(false), undefined
• C: 0, '', new Boolean(false), undefined
• D: All of them are falsy

Answer 1

Answer: A

There are 8 falsy values:

• undefined
• null
• NaN
• false
• '' (empty string)
• 0
• -0
• 0n (BigInt(0))

Function constructors, like new Number and new Boolean are truthy.