14920293
Description
Quiz by Kostas Diakogiannis, updated more than 1 year ago
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Created by Kostas Diakogiannis
over 5 years ago
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Question 1
Question
In which type of applications can JavaScript be used specifically?
Answer
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Web, only frontend
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Web in general. Frontend and Backend.
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Web, mobile, desktop and IoT applications.
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Only web and mobile.
Question 2
Question
What is console used for?
Answer
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To print the result of a JS Math operation there.
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To hide/show HTML elements from the page.
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To store variables and their values there.
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To display a selected piece of JS code there.
Question 3
Question
What will this print to the console?
console.log( '10'/2);
Answer
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'5'
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5
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'10/2'
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Error! Cannot divide string with a number!
Question 4
Question
What does the following statement prints to the console?
console.log(23 + '3');
Answer
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'233'
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'323'
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26
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'26'
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Error. Cannot add a number and a string!
Question 5
Question
What does the following statement prints to the console?
console.log(30 + 20 + 10 + '5' + 10);
Answer
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error!
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615
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75
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60510
Question 6
Question
What does the following code prints to the console?
var result = (25 + '10') / 10;
console.log(typeof result);
Answer
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"string"
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"number"
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Error!
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undefined
Question 7
Question
Select the correct phrase that is true regarding JS variables.
Answer
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JavaScript variables are case insensitive. That means we don't have to worry if a variable's name is written in uppercase or lowercase.
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We can use variables in our scripts even if we have defined them later in our script (in a line more below).
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A variable can't hold as it's own value, another variable.
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We are not allowed to re-assign a new value into a variable that already holds one. We are not allowed to update a variable's value.
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