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UsmanGhias CODCrafters CodewithUsman JavaScript C007 OOP JS

Scientific Calculator

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Description of Code java 

JavaScript line by line Code description

  1. const actions = document.querySelector('.actions'); : This line uses the querySelector method to select the HTML element with the class name "actions" and assigns it to a constant variable called actions. The const keyword is used to declare a constant variable that cannot be reassigned once it has been initialized.
  2. const ans = document.querySelector('.ans'); : This line uses the querySelector method to select the HTML element with the class name "ans" and assigns it to a constant variable called ans.
  3. console.log(actions); : This line logs the actions constant variable to the console. The console.log() method is used to output a message or a value to the browser console for debugging purposes.
  4. console.log(ans); : This line logs the ans constant variable to the console.
  5. Initialize a variable named expression and set its initial value to an empty string. 
  6. Initialize a variable named a and set its initial value to 0. 
  7. Attach an event listener to the DOM element with a class of actions that listens for a click event. 
  8. Output the clicked element to the console for debugging purposes.
  9. Retrieve the value attribute of the clicked element using the dataset property. 
  10. Use conditional statements to determine the operation to be performed based on the retrieved value. These operations include clearing the expression, calculating the square of a number, calculating the square root of a number, calculating the logarithm of a number, calculating the sine of a number, calculating the cosine of a number, calculating the tangent of a number, evaluating an expression, or concatenating a value to the expression.
  11. Reset the expression and display the answer if the expression is undefined.
  12. If the expression is defined, display its value. 
  13. Define a function named square that calculates the square of the expression using the eval() function.

 


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