Q&A

Review the following code snippet: if (counter <= 10 && show === false) {    console.log("test"); } What values can the counter and show variables have so that the console displays "test" as a result…

Review the following code: if (counter <= 10) {    if (counter >= 10) {     console.log(1);    } } We can replace it using: if (true) console.log(1);  if (false) console.log(1);  if (counter >= 10)…

Review the following code: let x = 100; if (x < 100)    x = 20; console.log(x) What will be displayed in the console as a result of its execution? nothing 100 …

Which of the following operators is a ternary one? An assignment operator =. A conditional operator ? :. A typeof operator. An increment operator ++. Explanation & Hint: The ternary operator in JavaScript is represented by the ? and : symbols. It is…

We want to rewrite the following code snippet using the conditional operator: let name; if (test) {    name = "Alice"; } else {    name = "Bob"; } Which notation is…

The condition if (!a) can be replaced by the condition: if (a); if (!!a);  if (a === false);  if (a == false); Explanation & Hint: The condition if (!a) in JavaScript can…

The condition if( a >= 0 ) can be replaced by the condition: if (a > 0 || a == 0);  if (a > 0 && a == 0);  if (0 <…

The methods window.altert, window.confirm, and window.prompt are methods of the window object. Which of the following is not true? The alert, confrim, and prompt methods require an argument specifying the position of…

Analyze the code snippet: let nr = "1"; let x = (nr === 1); let y = (nr == 1); let z = (nr = 1); After its execution, the…

The string "12" has been written into the str variable: (let str = "12";). Then the operations str = +str is performed. As a result, the variable str will contain: NaN 12…

The confirm method allows you to create a dialog box. What value does this method return when the user closes the window? Always true. Always false. The string entered by…

Analyze the code snippet: let n = 10; let m = ++n; Its execution will result in the following values in the variables n and m: n: 11, m: 10 n: 10, m:…

The result of the comparison "abcd" > "Abcd" will be: "abcd" true false 1 Answers Explanation & Hints: The result of the comparison "abcd" > "Abcd" will be true. When comparing…

Analyze the code snippet: let n = 2 * 3 ** 3 - 1; The result is stored in the variable n is: 18 36 215 53 Answers Explanation &…

The number 2 is stored in the variable n (let n = 2;). The command n = n*n*n is then called. This last command can be replaced by: n **= n; n **=…

The result of the operation !(true && false || true) will be: null false 1 true Answers Explanation & Hints: The result of the operation "!(true && false || true)" will…

Which operator do we use if we want to check if two variables store the same values of exactly the same type? = === == !== Answers Explanation & Hints:…

Analyze the following code: let test = prompt("Hello", "World"); What value will the test variable have if, after running the code, we immediately press the Ok button on the newly created…

The result of the operation 3 * 4 > 20 - 15 will be: NaN false true -14 Answers Explanation & Hints: To evaluate the expression "3 * 4 >…

The result of the operation false || "false" will be: 0 "false" false true Answers Explanation & Hints: The result of the operation false || "false" in JavaScript is indeed false.…