JavaScript Comparisons and Conditionals Quiz

To pass the quiz, you must correctly answer at least 9 of the 10 questions below. # --quizzes-- ## --quiz-- ### --question-- #### --text-- What's the result of the expression `undefined > 0`? #### --distractors-- `true` --- `undefined` --- `null` #### --answer-- `false` ### --question-- #### --text-- Which logical operation does `||` represent? #### --distractors-- XOR --- AND --- NOT #### --answer-- OR ### --question-- #### --text-- What's the output of the following code? ```js console.log(5 === 2 + 3 || 4 == 2); ``` #### --distractors-- `undefined` --- `false` --- An error is raised. #### --answer-- `true` ### --question-- #### --text-- What is a truthy and falsy value? #### --distractors-- A value that's both `true` and `false`. --- A value that changes depending on context. --- A value that functions differently than `true` or `false` value. #### --answer-- A value that is considered `true` or `false` when encountered in a Boolean context. ### --question-- #### --text-- What's logged to the console from the code below? ```js if (1) { console.log("True!"); } ``` #### --distractors-- `false` --- Nothing gets printed to the console. --- An error is raised. #### --answer-- `True!` ### --question-- #### --text-- What's the difference between `undefined` and `null`? #### --distractors-- `null` and `undefined` point to an out-of-range memory location and are inaccessible. --- `null` is the implicit value assigned to variables and it can not be changed, while `undefined` is the explicit value assigned to variables. --- `null` is a global property, `undefined` is not. #### --answer-- Variables without a value are `undefined`, while `null` represents an intentional absence of an object value. ### --question-- #### --text-- What happens when you don't include `break` while implementing a `switch` statement? #### --distractors-- The `switch` statement will stop abruptly. --- The `switch` statement will throw an error after previous statement. --- The `switch` statement will exit after the first match. #### --answer-- The code continues to evaluate the following `case` statements, even after finding a match. ### --question-- #### --text-- What is printed to the console from the code below? ```js const a = 2; if (1 == "1") { let b = 3; console.log(a + b); } console.log(b); ``` #### --distractors-- An error is raised. --- ```js 5 3 ``` --- ```js 5 undefined ``` #### --answer-- `5`, and then an error is raised. ### --question-- #### --text-- What will be the output of the following JavaScript code? ```js let vehicle = "car"; switch (vehicle) { case "bike": console.log("Bikes are two-wheelers."); break; case "car": console.log("Some cars are 4x4."); case "truck": console.log("Trucks can carry heavy loads."); break; default: console.log("Unknown vehicle."); } ``` #### --distractors-- ```md Some cars are 4x4. ``` --- ```md Some cars are 4x4. Trucks can carry heavy loads. Unknown vehicle. ``` --- ```md Unknown vehicle. ``` #### --answer-- ```md Some cars are 4x4. Trucks can carry heavy loads. ``` ### --question-- #### --text-- What is printed to the console with code below? ```js let x = 5; if (x > 1 && x < 10) { console.log("x is between 1 and 10"); } else { console.log("x is not between 1 and 10"); } ``` #### --distractors-- An error is raised. --- Nothing is printed. --- `x is not between 1 and 10` #### --answer-- `x is between 1 and 10`