14986298
Descrição
Quiz por Kostas Diakogiannis, atualizado more than 1 year ago
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Criado por Kostas Diakogiannis
mais de 6 anos atrás
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Questão 1
Questão
Which of the following values evaluate eventually to false?
Responda
-
22
-
0
-
'undefined'
-
!false
Questão 2
Questão
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!');
Responda
-
You have selected 3
-
You have selected nothing!
-
error! A break keyword is missing.
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You have selected 3 You have selected nothing!
Questão 3
Questão
When is it appropriate to use a switch-case syntax in favor of if-else statements?
Responda
-
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.
-
In any case. Switch cases provide a better and cleaner syntax to work with.
-
In case we want to compare a variable if is greater or lower than a specific value.
Questão 4
Questão
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');
}
Responda
-
2
-
You have selected 5 pieces.
-
The number of your choice.
-
Syntax error.
Questão 5
Questão
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?
Responda
-
none
-
all
-
2, 4, 6, 8, 10
-
1, 3, 5, 7, 9
Questão 6
Questão
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?
Responda
-
Of course i do. Party animal rules.
-
Nope. Misery at it's best.
Questão 7
Questão
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');
Responda
-
I told you, you can't play today!
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Play freely without fear
Questão 8
Questão
Select one of the following statements that is wrong.
Responda
-
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.
-
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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