Variables & Constants in JavaScript (OCR A-Level Computer Science): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What do variables in JavaScript do?
What do variables in JavaScript do?
Store & modify data values
What are constants in JavaScript?
What are constants in JavaScript?
Fixed values, cannot change once set
Which keyword is used to declare constants?
Which keyword is used to declare constants?
const
Which keywords can declare variables?
Which keywords can declare variables?
let or var
Which basic data types does JavaScript support?
Which basic data types does JavaScript support?
Numbers, strings, booleans
Can you reassign a constant after initial assignment?
Can you reassign a constant after initial assignment?
No, cannot be reassigned
What type of scope does var have?
What type of scope does var have?
Function scope
When should you use let?
When should you use let?
For variables that change
Why avoid using var in favor of let or const?
Why avoid using var in favor of let or const?
var has function scope, unexpected results
Which correctly declares a constant?
Which correctly declares a constant?
const pi = 3.14159;