JavaScript Flashcards
Lines of code that Javascript will intentionally ignore.
Comments
In computer science, what is data?
Anything that is meaningful to the computer
How many different data types does Javascript have?
7
What does string mean?
Any sort of text
What is number?
A number
What is undefined?
Something that hasn’t been defined
What is null?
Nothing
What is a boolean?
True or false
Symbol
An immutable primitive value that is unique
What is an object?
Stores a lot of different key value pairs
Where do you set data?
Into a variable
What does a variable allow computers to do to data?
Store and manipulate it in dynamic fashion
How do you declare a variable?
var keyword
What is it common to set something to?
A string
How many ways can you declare a variable?
What are they?
3
Var, let, const
Where can var be used?
Throughout the entire program
Where can let be used?
Within the scope of where you declared it
What is const?
A variable that can never change
What happens if you try to change a const?
ERROR
What is the equal sign?
Assignment operator
How do you assign a variable?
var (blank);
Why should you use a semicolon?
So you know where the end of the line is
var b = 2;
What does this line mean?
2 is being assigned to B.
How would you assign 7 to a?
a = 7;
