Flutter string to double

Parse source as a, possibly signed, integer literal and return its value . The source must be a non-empty sequence of base- radix digits, optionally prefixed with a minus or plus sign (‘-‘ or ‘+’).

Parse a String into an int in Dart/Flutter parse(‘n42’); print(n); } on FormatException { print(‘Format error! ‘); } // Format error! int class parse() method also gives us a way to handle FormatException case with onError parameter. When the exception is thrown, onError will be called with source as input string.

Parse source as a double literal and return its value . Accepts an optional sign ( + or – ) followed by either the characters “Infinity”, the characters “NaN” or a floating-point representation. A floating-point representation is composed of a mantissa and an optional exponent part.

Parse(String) Converts the string representation of a number to its double-precision floating-point number equivalent . Parse(String, NumberStyles) Converts the string representation of a number in a specified style to its double-precision floating-point number equivalent.

Parses a string containing a number literal into a number . The method first tries to read the input as integer (similar to int. parse without a radix). If that fails, it tries to parse the input as a double (similar to double.