How Do You Convert an Object to a Double in Dart?

You can convert an object to a double in Dart using the toDouble() method. This method is available for various data types, including int, String, and num.

Here's how it works:

• int to double: If you have an integer (int) and want to convert it to a double, you can simply use the toDouble() method.

int myInt = 10;
double myDouble = myInt.toDouble(); // myDouble will be 10.0

• String to double: To convert a string (String) to a double, you can use the double.parse() or double.tryParse() methods.

String myString = "10.5";
double myDouble = double.parse(myString); // myDouble will be 10.5

• num to double: If you have a num object, which can be either an integer or a double, you can use the toDouble() method to convert it to a double.

num myNum = 10;
double myDouble = myNum.toDouble(); // myDouble will be 10.0

Important Note: The double.tryParse() method is useful when you're uncertain if the string can be parsed into a double. It returns null if the parsing fails, preventing errors.

String myString = "abc";
double? myDouble = double.tryParse(myString); // myDouble will be null

Practical Insights:

• Use toDouble() whenever you need to represent a value with decimal precision.
• Employ double.parse() or double.tryParse() when converting strings to doubles, ensuring proper handling of potential errors.
• Remember that converting an object to a double might not always be possible, depending on the object's type and its underlying data.