Digital Timer App Built With React.js

In this project, let’s build a Digital Timer App by applying the concepts we have learned till now.

Refer to the image below:

Design Files

• Extra Small (Size < 576px), Small (Size >= 576px)
• Medium (Size >= 768px), Large (Size >= 992px) and Extra Large (Size >= 1200px)

Set Up Instructions

• Download dependencies by running npm install
• Start up the app using npm start

Completion Instructions

The app must have the following functionalities

• The default timer limit value should be 25 minutes
• When the Start button is clicked,
  • The Start text should change to Pause text
  • The play icon should be replaced by pause icon
  • The Timer status should change to Running
  • The Timer should start running backwards from the timer limit value set
  • If the Timer has been paused after starting, it should resume from where it was paused
  • Both the Plus and Minus buttons should be disabled
• When the Pause button is clicked,
  • The Pause text should change to Start text
  • The pause icon should be replaced by play icon
  • The Timer should stop running backwards
  • The Timer status should change to Paused
  • Both the Plus and Minus buttons should be disabled
• When the button with the Plus symbol is clicked,
  • The timer limit value should be incremented by one minute
  • The Timer should display time with the increased timer limit value
• When the button with the Minus symbol is clicked,
  • The timer limit value should be decremented by one minute
  • The Timer should display time with the decreased timer limit value
• When the timer limit value is modified by clicking the Plus or Minus button and the Start button is clicked, then the Timer should start with the modified timer value
• When the Timer ends (displays 00:00)
  • The Pause text should change to Start text
  • The pause icon should be replaced by play icon
  • The Timer should stop running backwards
  • The Timer status should change to Paused
• After completion of Timer, when the Start button is clicked,
  • The Start text should change to Pause text
  • The play icon should be replaced by pause icon
  • The Timer should start running backwards from the current timer limit value.
  • The Timer status should change to Running
• When the Reset button is clicked, then
  • The Pause text should change to Start text
  • The pause icon should be replaced by play icon
  • The Timer should stop running backwards
  • The Timer status should change to Paused
  • Initial Timer limit value should be displayed
  • Both the Plus and Minus buttons should be enabled

Use these files to complete the implementation:

• src/components/DigitalTimer/index.js
• src/components/DigitalTimer/index.css

Quick Tips

• You can use the box-shadow CSS property to apply the box-shadow effect to containers

    box-shadow: 0px 4px 16px 0px #bfbfbf;
  

• You can use Math.floor() function that returns the largest integer less than or equal to a given number

  console.log(Math.floor(5.95)); // output: 5

• You can use the background-position CSS property to set the starting position of a background image

  background-position: center;
  

Resources

• https://assets.ccbp.in/frontend/react-js/digital-timer-elapsed-bg.png
• https://assets.ccbp.in/frontend/react-js/play-icon-img.png alt should be play icon
• https://assets.ccbp.in/frontend/react-js/pause-icon-img.png alt should be pause icon
• https://assets.ccbp.in/frontend/react-js/reset-icon-img.png alt should be reset icon

• Roboto

Things to Keep in Mind

• All components you implement should go in the src/components directory.
• Don’t change the component folder names as those are the files being imported into the tests.
• Do not remove the pre-filled code
• Want to quickly review some of the concepts you’ve been learning? Take a look at the Cheat Sheets.