1.js

// Predict and explain first...
// Why will an error occur when this program runs?
// =============> write your prediction here
// 1.*Answer
// We have declared "decimalNumber" twice, which is not allowed.
// It is already declared as a function parameter, causing a conflict.
// console.log(decimalNumber) results in an error because it is outside
// the function scope.It should call console.log(convertToPercentage(decimalNumber));

//Try playing computer with the example to work out what is going on
//    function convertToPercentage(decimalNumber) {
//      const decimalNumber = 0.5;
//      const percentage = `${decimalNumber * 100}%`;

//      return percentage;
//    }
//    console.log(decimalNumber);

// =============> write your explanation here
// 2.*Answer
//  It throws an error detailed below;
//   /home/justice/Documents/CYF/Module-Structuring-and-Testing-Data/Sprint-2/1-key-errors/1.js:12
//   const decimalNumber = 0.5;
//            ^
// SyntaxError: Identifier 'decimalNumber' has already been declared

// Removed the const declaration and returned the percentage calculation
// using a template literal to append the percent symbol.

// Finally, correct the code to fix the problem
// =============> write your new code here
  function convertToPercentage(decimalNumber) {
    return `${decimalNumber * 100}%`;
  }

  console.log(convertToPercentage(0.5));//returns 50%