Unit-Converter/script.js at master · ScubaMonster/Unit-Converter · GitHub

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function convert() {
  const inputValue = parseFloat(document.getElementById("inputValue").value);
  const outputUnit = document.getElementById("outputUnit").value;
  const inputUnit = document.getElementById("inputUnit").value;
  const resultElement = document.getElementById("resultValue");

  if (isNaN(inputValue)) {
    resultElement.textContent = "Please enter a number.";
    return;
  }

  let result = 0;
  let metersValue = 0;

  // Step 1: same unit OR normalize to meters
  if (inputUnit === outputUnit) {
    result = inputValue;
  } else {
    // convert input → meters
  if (inputUnit === "miles") {
    metersValue = inputValue * 1609.34;
  } else if (inputUnit === "kilometers") {
    metersValue = inputValue * 1000;
  } else if (inputUnit === "feet") {
    metersValue = inputValue / 3280.84;
  } else if (inputUnit === "meters") {
    metersValue = inputValue;
  }

  // convert meters → output
  if (outputUnit === "miles") {
    result = metersValue / 1609.34;
  } else if (outputUnit === "kilometers") {
    result = metersValue / 1000;
  } else if (outputUnit === "feet") {
    result = metersValue * 3280.84;
  } else if (outputUnit === "meters") {
    result = metersValue;
  }
}

  const resultString =
    inputValue + " " + inputUnit + " = " + result.toFixed(2) + " " + outputUnit;

  console.log(resultString);
  resultElement.textContent = resultString;
}