Truthy/Falsy

Question 0

Truthy/Falsy:

function testNumber(x) {
   if(!x) {
      console.log("no number entered");
   }
   ...

When will this test fail?

Answer 0

When x==0 (falsy) the test will if statement will pass and log that no number was entered.

Question 1

Truthy/Falsy:

Which values are considered falsy in JavaScript?

Answer 1

False, NaN, undefined, -0, 0, “”, null