Unsupported operation: Infinity or NaN toInt in Flutter: Causes and How to Fix

Check for NaN or Infinity Before Conversion

• Install the `dart:math` library to utilize utility functions that can help manage floating-point operations safely.
• Ensure any variable converted to an integer is first checked for `NaN` or `Infinity` using built-in methods like `isNaN()` or `isInfinite()`.

 

• Implement a guard clause in your code to handle these cases gracefully, converting the value to a fallback option if necessary.

import 'dart:math';

void safeToIntConversion(double value) {
  if (value.isNaN || value.isInfinite) {
    print('Cannot convert to int. Fallback executed.');
    // Handle your fallback logic here
  } else {
    int convertedValue = value.toInt();
    print('Converted Value: $convertedValue');
  }
}

Debugging and Logging

• Implement logging within your application to capture occurrences of `NaN` or `Infinity` outputs. This can aid in proactive debugging and better error monitoring.
• Use debugging insights to refine algorithms that might produce infinite or undefined results, especially when handling divisions, exponential calculations, or square roots.

 

• Incorporate error handling code to output informative debugging messages whenever a `NaN` or `Infinity` condition is encountered.

void logValue(double value) {
  assert(!value.isNaN, 'Encountered NaN value.');
  assert(!value.isInfinite, 'Encountered Infinity value.');
  
  if (!value.isNaN && !value.isInfinite) {
    print('Value is safe: $value');
  }
}

Adjust Mathematical Operations

• Review mathematical operations for potential zero divisions or calculations leading to overflow. Implement conditional checks where such risks exist to manage operations safely.
• Apply `try-catch` blocks if handling asynchronous streams or computations that may encounter invalid floating-point outcomes.

 

• Refactor complex expressions into smaller parts with checks after every major operation step, ensuring each operand is valid.

double divisionWithCheck(double numerator, double denominator) {
  if (denominator == 0) {
    throw Exception('Division by zero encountered');
  }
  return numerator / denominator;
}

void performDivision() {
  try {
    double result = divisionWithCheck(42, 0);  // This will throw an exception
    print(result);
  } catch (e) {
    print('Caught error: $e');
  }
}