1804887
Description
Quiz by Rene Escobar, updated more than 1 year ago
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Created by Rene Escobar
almost 10 years ago
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Question 1
Question
Which of these variables are not valid in Javascript?
Answer
-
4_colors
-
Color
-
color
-
$color
Question 2
Question
What happens when you declare a variable like
var myVar;
Answer
-
The variable value(output) is set to undefined
-
The variable value(output) is set to null
Question 3
Question
What are some of the main differences between null and undefined?
Answer
-
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"
Question 4
Question
=== operator is less strict in terms of identifying equality than ==
Answer
- True
- False
Question 5
Question
Variables created inside of a function can only be used within the function
Answer
- True
- False
Question 6
Question
Which var world is considered to have a global scope?
Answer
-
var date; function sayHello(){ }
-
function sayHello(){ var date; }
Question 7
Question
What will console log out in the following code?
var part1 = "Team ";
function bam() {
var part2 = "Treehouse";
console.log(part2);
}
bam();
Answer
-
Treehouse
-
Undefined
-
Team
Question 8
Question
Declaring a variable without a var keyword will evaluate the variable with global scope
Answer
- True
- False
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