Tailrec (anyone-dart-tailrec)

This package help you to convert recursive function into the while-loop codes. so that program won't meet out of memory that caused by stack overflow. inspired by kotlin tailrec keywords. (https://kotlinlang.org/docs/functions.html#tail-recursive-functions)

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How to use

Math concepts 高中数学中的函数"不动点"

Calculate fixed point for cos(x)

import 'dart:core';
import 'package:tailrec/tailrec.dart';
import 'dart:math';

final eps = 1E-10; //precision

void main() {
  final firstValue = 1;

  var tailrec = Tailrec(
    conditionCallback: <double>(dynamic x) {
      final y = cos(x);
      final temp = (x - y).abs();
      return temp < eps;
    },
    recurringParamComputeCallback: <double>(dynamic x) {
      return cos(x) as double;
    },
    resultCallback: <double>(dynamic x) {
      return x;
    },
  );

  final fixedPoint = tailrec.apply(firstValue);
  print(fixedPoint);
}

Conclusion

cos(x) fixed point approximately equal to 0.7390851332151607

cos(0.7390851332151607) ≈ 0.7390851332151607

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