Javascript Variables

Descripción

Javascript Test sobre Javascript Variables, creado por Rene Escobar el 17/12/2014.
Rene Escobar
Test por Rene Escobar, actualizado hace más de 1 año
Rene Escobar
Creado por Rene Escobar hace casi 10 años
803
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Resumen del Recurso

Pregunta 1

Pregunta
Which of these variables are not valid in Javascript?
Respuesta
  • 4_colors
  • Color
  • color
  • $color

Pregunta 2

Pregunta
What happens when you declare a variable like var myVar;
Respuesta
  • The variable value(output) is set to undefined
  • The variable value(output) is set to null

Pregunta 3

Pregunta
What are some of the main differences between null and undefined?
Respuesta
  • Null is used to tell the program that a value is truly empty
  • Unlike undefined, null is a falsy value
  • typeof null will return "Object" and typeof undefined returns "undefined"

Pregunta 4

Pregunta
=== operator is less strict in terms of identifying equality than ==
Respuesta
  • True
  • False

Pregunta 5

Pregunta
Variables created inside of a function can only be used within the function
Respuesta
  • True
  • False

Pregunta 6

Pregunta
Which var world is considered to have a global scope?
Respuesta
  • var date; function sayHello(){ }
  • function sayHello(){ var date; }

Pregunta 7

Pregunta
What will console log out in the following code? var part1 = "Team "; function bam() { var part2 = "Treehouse"; console.log(part2); } bam();
Respuesta
  • Treehouse
  • Undefined
  • Team

Pregunta 8

Pregunta
Declaring a variable without a var keyword will evaluate the variable with global scope
Respuesta
  • True
  • False
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