Convert Variable From String To Float In Dart

In the world of programming, being able to manipulate and convert variable types is a skill that could help in making more efficient and error-free programs. In this article, we’ll discuss how to take a string variable and convert it into a float in the Dart programming language.

Code snippet: Convert String to Float in Dart

To convert a string to a float (double in Dart), we will use the parse method from the double class. Here is a simple code snippet that demonstrates how to do this.

void main() { 
  String strNumber = "10.50"; 
  double floatNumber; 

  floatNumber = double.parse(strNumber); 

  print(floatNumber);
}

When you run this program, it will output 10.5 which is the float equivalent of the string "10.50".

Code Explanation: Convert String to Float in Dart

In this section, we’ll explain each step in detail to help you fully understand how conversion from string to float is done.

1. Step 1: We first declare and initialize our strNumber with a string-number "10.50".

    String strNumber = "10.50"; 

2. Step 2: We then declare another variable floatNumber of type double. In Dart, double is used to represent floating point literals. variables of type double can store fractional numbers.

    double floatNumber; 

3. Step 3: The next step is the actual conversion. We use the Dart’s built-in double.parse() method for this. The double.parse() function attempts to convert the string to a double. If the string cannot be converted to a number (like if the string was “Hello” instead of “10.50”), then the program would crash with an error.

    floatNumber = double.parse(strNumber); 

4. Step 4: Finally we print the floatNumber to our console. floatNumber is now a double that you can do calculations or any other operations you would with a floating point number.

    print(floatNumber);

With these steps, you should be able to convert any string that contains a numeric value into a float in Dart. It’s a simple yet useful conversion method in Dart programming.