dart provided double.tryParse() function which will return null if the given value is not a number otherwise it returns a given number. so based on this feature we can check given value is a Number or not by the following code. bool _isNumeric(String result) { if (result == null) { return false; } return double.tryParse(result) != null; }
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OS Error: A required privilege is not held by the client errno = 1314