14986298
Description
Quiz by Kostas Diakogiannis, updated more than 1 year ago
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Created by Kostas Diakogiannis
about 6 years ago
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Question 1
Question
Which of the following values evaluate eventually to false?
Answer
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22
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0
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'undefined'
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!false
Question 2
Question
What does the following code produce as a message?
var numOfChoice = 3;
switch(numOfChoice) {
case 1:
console.log(`You have selected ${numOfChoice}');
break;
case 2:
console.log(`You have selected ${numOfChoice}');
break;
case 3:
console.log(`You have selected ${numOfChoice}');
default:
console.log(`You have selected nothing!');
Answer
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You have selected 3
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You have selected nothing!
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error! A break keyword is missing.
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You have selected 3 You have selected nothing!
Question 3
Question
When is it appropriate to use a switch-case syntax in favor of if-else statements?
Answer
-
There is no case at all, if else syntax is more precise and less error prone.
-
When we want to check multiple times if a variable holds a specific value.
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In any case. Switch cases provide a better and cleaner syntax to work with.
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In case we want to compare a variable if is greater or lower than a specific value.
Question 4
Question
What does the following code produce as a message to console?
var choice = 5;
if (choice == 2) {
console.log(2);
} else {
console.log(choice);
}else if (choice == 5) {
console.log('You have selected 5 pieces');
}
Answer
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2
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You have selected 5 pieces.
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The number of your choice.
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Syntax error.
Question 5
Question
Imagine we are having 10 numbers from 1 to 10. 1, 2, 3, 4, 5, 6, 7, ,8 ,9, 10.
For everyone of these numbers we run the following statement:
if (num % 2 !== 0 ) {
// Do something here
}
Under which numbers will this condition be executed?
Answer
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none
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all
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2, 4, 6, 8, 10
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1, 3, 5, 7, 9
Question 6
Question
Given that we have these variables:
var money = 2;
var drink = 5;
var inMood = true;
var freeTime = true;
if (money - drink > 0 || !inMood && freetime) {
console.log('Go out for a drink');
} else {
console.log('Stay in');
}
Will i go for a drink or what?
Answer
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Of course i do. Party animal rules.
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Nope. Misery at it's best.
Question 7
Question
What is the outcome of this statement?
var playFootball = true;
!playFootball ? console.log('I told you, you can't play today!') : console.log('Play freely without fear');
Answer
-
I told you, you can't play today!
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Play freely without fear
Question 8
Question
Select one of the following statements that is wrong.
Answer
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In if else statements, it is a good practice to check the more unique condition first and then the more general.
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There is no limit to how many 'if else' statements we can put as alternatives to an if block.
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Default option is mandatory inside a switch case block.
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'Else' statement is mandatory as alternative to an 'if' block.
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