AWS, JavaScript, React - Deploy Web Apps on the Cloud - Implementing the Calculator - Operators

This video tutorial guides viewers through the process of enhancing a calculator application by implementing a calculation function, updating the state and display, handling operator inputs, and debugging errors. The lesson covers creating a function to perform calculations, updating the calculator's state with new totals, and managing operator inputs. It concludes with testing the calculator and identifying errors, providing a comprehensive understanding of building a functional calculator app.

What is the initial value displayed on the calculator before any input?

• 5

• 0

• 10

• 1

What is the primary role of the 'do calculation' function?

• To update the display with the new total

• To concatenate numbers

• To reset the calculator

• To handle button clicks

How is the last pressed operator stored in the calculator's state?

• As an array

• As a number

• As a string

• As a boolean

Which operation is NOT handled by the switch case in the 'do calculation' function?

• Exponentiation

• Subtraction

• Multiplication

• Addition

What is the purpose of the default case in the switch statement?

• To keep the current value

• To reset the calculator

• To handle unknown operators

• To perform division

What does the clear button do when pressed?

• Resets the calculator to its initial state

• Adds a zero to the display

• Performs a calculation

• Displays an error message

What was the error encountered when testing the equals button?

• The equals button was not clickable

• The calculator displayed the wrong total

• The calculator reset unexpectedly

• The equals button did not update the display

What is the purpose of debugging in the context of this lesson?

• To improve the user interface

• To fix errors and ensure correct functionality

• To add new features

• To optimize performance

Which function is responsible for resetting the calculator?

• handleEquals

• doCalculation

• handleClear

• setCalc

What is the expected outcome when pressing the equals button after performing operations?

• The calculator should reset

• An error message should appear

• The display should clear

• The current total should be displayed