JS - Knowledge Check

Create a variable called carName, assign the value Volvo to it.

let ________ = "________"

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Display the sum of 5 + 10, using two variables: x and y.

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Create a variable called z, assign x + y to it, and display the result in an alert box.

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On one single line, declare three variables with the following names and values:

firstName = "John"
lastName = "Doe"
age = 35

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Make the function return "Hello".

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Create a function called "myFunction".

What is the correct JavaScript syntax to change the content of the HTML element below?

<p id="demo">This is a demonstration.</p>

• document.getElementByName("p").innerHTML = "Hello World!";

• #demo.innerHTML = "Hello World!";

• document.getElementById("demo").innerHTML = "Hello World!";

• document.getElement("p").innerHTML = "Hello World!";

What will the following code output?

console.log(10 + "5");

• 15

• 105

• TypeError

• NaN

Answer explanation

Explanation: The + operator is used for both addition and concatenation in JavaScript. When one of the operands is a string, the other operand is converted to a string and concatenated.

How do you write a conditional statement in JavaScript?

• if i = 5 then

• if (i == 5)

• if i = 5

• if i == 5 then

Answer explanation

Explanation: The correct syntax for a conditional statement in JavaScript is if (condition) { ... }.

Which function is used to print something in the browser console?

• console.print()

• print()

• log()

• console.log()

Answer explanation

Explanation: The console.log() function is used to print messages to the browser console in JavaScript.