JavaScript Math Quiz

To pass the quiz, you must correctly answer at least 18 of the 20 questions below. # --quizzes-- ## --quiz-- ### --question-- #### --text-- What does `NaN` stand for? #### --distractors-- `Numeric and Number` --- `Not a Null` --- `Null and Number` #### --answer-- `Not a Number` ### --question-- #### --text-- Which of the following is NOT an arithmetic operator in JavaScript? #### --distractors-- `*` --- `+` --- `-` #### --answer-- `??` ### --question-- #### --text-- What happens if you try to divide by zero in JavaScript? #### --distractors-- JavaScript will output 0. --- Nothing will happen. --- JavaScript will throw an error. #### --answer-- JavaScript will output `Infinity` ### --question-- #### --text-- Which of the following is the correct use of the exponentiation operator? #### --distractors-- `2*3` --- `2#3` --- `2%3` #### --answer-- `2**3` ### --question-- #### --text-- Which operator should you use when decrementing a variable in JavaScript? #### --distractors-- `++` --- `//` --- `**` #### --answer-- `--` ### --question-- #### --text-- Which of the following is NOT a bitwise operator? #### --distractors-- `&` --- `|` --- `^` #### --answer-- `>` ### --question-- #### --text-- Which of the following is the correct compound operator for getting the remainder? #### --distractors-- `//=` --- `\=` --- `%%=` #### --answer-- `%=` ### --question-- #### --text-- What is the difference between the `==` and `===` operators? #### --distractors-- There is no difference. The comparison result will always have the same result. --- The `==` operator is used to check if the data type is the same while the `===` is used to check if the value is equal. --- The `==` operator can only be used with primitive types while the `===` operator is only used for objects. #### --answer-- The `==` operator only compares values whereas the `===` operator compares values and types. ### --question-- #### --text-- What is the unary plus operator (`+`) used for? #### --distractors-- It is used to decrement a value by one. --- It is used to get the remainder from an operation. --- It is used to invert the binary representation of a number. #### --answer-- It is used to convert its operand into a number. ### --question-- #### --text-- Which of the following `Math` methods rounds a value to the nearest whole integer? #### --distractors-- `Math.trunc()` --- `Math.max()` --- `Math.min()` #### --answer-- `Math.round()` ### --question-- #### --text-- What does the `Math.sqrt()` method do? #### --distractors-- This method returns a random floating point number. --- This method returns the absolute value for a number. --- This method returns the cube of a number. #### --answer-- This method returns the square root of a number. ### --question-- #### --text-- Which of the following is NOT a valid method for the `Math` object? #### --distractors-- `Math.ceil()` --- `Math.pow()` --- `Math.abs()` #### --answer-- `Math.extend()` ### --question-- #### --text-- Which of the following will return `false`? #### --distractors-- `isNaN("Matt")` --- `isNaN()` --- `isNaN(undefined)` #### --answer-- `isNaN(7)` ### --question-- #### --text-- What does the `parseFloat()` method do? #### --distractors-- It parses a string argument and performs a bitwise operation on it. --- It parses a string argument and returns `false`. --- It parses a string argument and returns an integer. #### --answer-- It parses a string argument and returns a floating-point number. ### --question-- #### --text-- What will be logged to the console? ```js let num = 5; console.log(++num); ``` #### --distractors-- `error` --- `null` --- `5` #### --answer-- `6` ### --question-- #### --text-- What would be the output for the following code? ```js console.log(5 == '5'); ``` #### --distractors-- `undefined` --- `false` --- `null` #### --answer-- `true` ### --question-- #### --text-- What is operator precedence? #### --distractors-- Operator precedence is used to check if the value on the left is less than the one on the right. --- Operator precedence is used to raise a variable to the power of the specified number and reassigns the result to the variable. --- Operator precedence is used to increase the value by one. #### --answer-- Operator precedence determines the order in which operations are evaluated in an expression. ### --question-- #### --text-- Which of the following is NOT a comparison operator? #### --distractors-- `>` --- `>=` --- `<` #### --answer-- `!>` ### --question-- #### --text-- What does the unary negation operator (`-`) do? #### --distractors-- It flips the boolean value of its operand. --- It decreases the value by one. --- It increases the value by one. #### --answer-- It negates the operand. ### --question-- #### --text-- Which of the following is an example of using the nullish coalescing operator? #### --distractors-- ```js const userSettings = { theme: null, volume: 0, notifications: false, }; userSettings.theme () 'light'; ``` --- ```js const userSettings = { theme: null, volume: 0, notifications: false, }; userSettings.theme ** 'light'; ``` --- ```js const userSettings = { theme: null, volume: 0, notifications: false, }; userSettings.theme \\ 'light'; ``` #### --answer-- ```js const userSettings = { theme: null, volume: 0, notifications: false, }; userSettings.theme ?? 'light'; ```