14920293
Descripción
Test por Kostas Diakogiannis, actualizado hace más de 1 año
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Creado por Kostas Diakogiannis
hace alrededor de 6 años
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Pregunta 1
Pregunta
In which type of applications can JavaScript be used specifically?
Respuesta
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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.
Pregunta 2
Pregunta
What is console used for?
Respuesta
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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.
Pregunta 3
Pregunta
What will this print to the console?
console.log( '10'/2);
Respuesta
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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!
Pregunta 4
Pregunta
What does the following statement prints to the console?
console.log(23 + '3');
Respuesta
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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!
Pregunta 5
Pregunta
What does the following statement prints to the console?
console.log(30 + 20 + 10 + '5' + 10);
Respuesta
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error!
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615
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75
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60510
Pregunta 6
Pregunta
What does the following code prints to the console?
var result = (25 + '10') / 10;
console.log(typeof result);
Respuesta
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"string"
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"number"
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Error!
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undefined
Pregunta 7
Pregunta
Select the correct phrase that is true regarding JS variables.
Respuesta
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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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