Learn JavaScript from Scratch JavaScript for Everyone - JavaScript Hoisting

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Information Technology (IT), Architecture
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University
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Hard
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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens when a variable is declared without an initial value in JavaScript?
It is assigned a default value of 0.
It is assigned a default value of null.
It is assigned a default value of undefined.
It is assigned a default value of an empty string.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In JavaScript, what is the effect of hoisting on variable declarations?
Variables are converted to strings.
Variables are deleted if not used.
Variables are moved to the top of their scope.
Variables are initialized with a default value.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the output of a console log for a hoisted variable before it is assigned a value?
null
undefined
An error message
The assigned value
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why might understanding hoisting be important when writing JavaScript code?
To ensure variables are always initialized.
To improve code execution speed.
To automatically convert data types.
To avoid reference errors by knowing variable availability.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a closure in JavaScript?
A technique to speed up code execution.
A way to declare variables globally.
A method to access variables from outside their scope.
A tool to convert data types.
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