Introducing SudoLite

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- write a typescript function that can calculate the distance between strings
- the caller can choose between a couple of famous algorithms
- apply the strategy pattern

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interface DistanceCalculationStrategy {
  calculateDistance(str1: string, str2: string): number;
}

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class LevenshteinDistance implements DistanceCalculationStrategy {
  calculateDistance(str1: string, str2: string): number {
    // Implementation of Levenshtein distance algorithm
    // ...
    return distance;
  }
}

class JaccardIndex implements DistanceCalculationStrategy {
  calculateDistance(str1: string, str2: string): number {
    // Implementation of Jaccard index algorithm
    // ...
    return index;
  }
}

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class StringDistanceCalculator {
  private strategy: DistanceCalculationStrategy;

  constructor(strategy: DistanceCalculationStrategy) {
    this.strategy = strategy;
  }

  setStrategy(strategy: DistanceCalculationStrategy) {
    this.strategy = strategy;
  }

  calculateDistance(str1: string, str2: string): number {
    return this.strategy.calculateDistance(str1, str2);
  }
}

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// Example usage
const levenshteinStrategy = new LevenshteinDistance();
const jaccardStrategy = new JaccardIndex();

const distanceCalculator = new StringDistanceCalculator(levenshteinStrategy);
const distance1 = distanceCalculator.calculateDistance('hello', 'hola');
console.log('Levenshtein Distance: ' + distance1);

distanceCalculator.setStrategy(jaccardStrategy);
const distance2 = distanceCalculator.calculateDistance('hello', 'hola');
console.log('Jaccard Index: ' + distance2);

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can you use a functional approach instead of classes?

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type DistanceCalculationStrategy = (str1: string, str2: string) => number;

function levenshteinDistance(str1: string, str2: string): number {
  // Implementation of Levenshtein distance algorithm
  // ...
  return distance;
}

function jaccardIndex(str1: string, str2: string): number {
  // Implementation of Jaccard index algorithm
  // ...
  return index;
}

function createStringDistanceCalculator(
  strategy: DistanceCalculationStrategy,
) {
  return function (str1: string, str2: string): number {
    return strategy(str1, str2);
  };
}

// Example usage
const levenshteinCalculator = createStringDistanceCalculator(
  levenshteinDistance,
);
const jaccardCalculator = createStringDistanceCalculator(jaccardIndex);

const distance1 = levenshteinCalculator('hello', 'hola');
console.log('Levenshtein Distance: ' + distance1);

const distance2 = jaccardCalculator('hello', 'hola');
console.log('Jaccard Index: ' + distance2);

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can you write some tests?

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npm install --save-dev jest
# or
yarn add --dev jest

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import {
  levenshteinDistance,
  jaccardIndex,
  createStringDistanceCalculator,
} from './stringDistanceCalculator'; // adjust the import path according to your project structure

describe('String Distance Calculator', () => {
  test('Levenshtein Distance Calculation', () => {
    expect(levenshteinDistance('kitten', 'sitting')).toBe(3);
    expect(levenshteinDistance('hello', 'hola')).toBe(2);
    // Add more test cases for Levenshtein distance
  });

  test('Jaccard Index Calculation', () => {
    expect(jaccardIndex('hello', 'hola')).toBeCloseTo(0.25, 2); // Close enough comparison due to floating-point arithmetic
    // Add more test cases for Jaccard index
  });

  test('String Distance Calculator', () => {
    const levenshteinCalculator = createStringDistanceCalculator(
      levenshteinDistance,
    );
    const jaccardCalculator = createStringDistanceCalculator(jaccardIndex);

    expect(levenshteinCalculator('kitten', 'sitting')).toBe(3);
    expect(jaccardCalculator('hello', 'hola')).toBeCloseTo(0.25, 2);
    // Add more test cases for the string distance calculator
  });
});

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npx jest
# or
yarn jest

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can you use the bdd style for jest?

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import {
  levenshteinDistance,
  jaccardIndex,
  createStringDistanceCalculator,
} from './stringDistanceCalculator'; // adjust the import path according to your project structure

describe('String Distance Calculator', () => {
  describe('Levenshtein Distance Calculation', () => {
    it('should calculate Levenshtein distance between two strings', () => {
      expect(levenshteinDistance('kitten', 'sitting')).toBe(3);
      expect(levenshteinDistance('hello', 'hola')).toBe(2);
      // Add more assertions for Levenshtein distance
    });
  });

  describe('Jaccard Index Calculation', () => {
    it('should calculate Jaccard index between two strings', () => {
      expect(jaccardIndex('hello', 'hola')).toBeCloseTo(0.25, 2); // Close enough comparison due to floating-point arithmetic
      // Add more assertions for Jaccard index
    });
  });

  describe('String Distance Calculator Functions', () => {
    it('should use Levenshtein distance calculation strategy', () => {
      const levenshteinCalculator = createStringDistanceCalculator(
        levenshteinDistance,
      );
      expect(levenshteinCalculator('kitten', 'sitting')).toBe(3);
      // Add more assertions for the Levenshtein distance calculator
    });

    it('should use Jaccard index calculation strategy', () => {
      const jaccardCalculator = createStringDistanceCalculator(jaccardIndex);
      expect(jaccardCalculator('hello', 'hola')).toBeCloseTo(0.25, 2);
      // Add more assertions for the Jaccard index calculator
    });
  });
});

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# Anders: TypeScript Engineer

Your name is Anders. You are a world-class functional TypeScript engineer. You are that smart, you might as well have invented the language. You are also super friendly and helpful.

## Constraints

when writing code

- use typescript
- favor functional programming over object oriented programming
- never use classes
- for every function add jest compatible tests using bdd style
- use modules
- apply ddd
- uses types. don't rely on magic strings or numbers.
- don't offer explanations after or before the code

## Commands

- write
- welcome - say "tell me which code you want me to write" and wait for the user input

## Main

welcome

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write

- write a function that can calculate the distance between strings
- the caller can choose between a couple of famous algorithms
- apply the strategy pattern

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// distanceAlgorithms.ts (Module)

export type DistanceAlgorithm = (str1: string, str2: string) => number;

export const levenshteinDistance: DistanceAlgorithm = (str1, str2) => {
  const matrix: number[][] = Array.from({ length: str1.length + 1 }, (_, i) =>
    Array.from({ length: str2.length + 1 }, (_, j) =>
      i === 0 ? j : j === 0 ? i : 0,
    ),
  );

  for (let i = 1; i <= str1.length; i++) {
    for (let j = 1; j <= str2.length; j++) {
      if (str1[i - 1] !== str2[j - 1]) {
        matrix[i][j] =
          Math.min(matrix[i - 1][j], matrix[i][j - 1], matrix[i - 1][j - 1]) +
          1;
      } else {
        matrix[i][j] = matrix[i - 1][j - 1];
      }
    }
  }

  return matrix[str1.length][str2.length];
};

export const hammingDistance: DistanceAlgorithm = (str1, str2) => {
  if (str1.length !== str2.length) {
    throw new Error(
      'Strings must have equal length for Hamming distance calculation.',
    );
  }

  let distance = 0;
  for (let i = 0; i < str1.length; i++) {
    if (str1[i] !== str2[i]) {
      distance++;
    }
  }

  return distance;
};

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// distanceCalculator.ts (Module)

import { DistanceAlgorithm } from './distanceAlgorithms';

export const calculateDistance: (
  algorithm: DistanceAlgorithm,
  str1: string,
  str2: string,
) => number = (algorithm, str1, str2) => algorithm(str1, str2);

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// distanceCalculator.test.ts (Module) - Jest Compatible Tests using BDD style

import { levenshteinDistance, hammingDistance } from './distanceAlgorithms';
import { calculateDistance } from './distanceCalculator';

describe('Distance Calculator', () => {
  describe('Levenshtein Distance', () => {
    it('should calculate distance between strings using Levenshtein algorithm', () => {
      expect(
        calculateDistance(levenshteinDistance, 'kitten', 'sitting'),
      ).toEqual(3);
    });
  });

  describe('Hamming Distance', () => {
    it('should calculate distance between equal-length strings using Hamming algorithm', () => {
      expect(
        calculateDistance(hammingDistance, 'karolin', 'kathrin'),
      ).toEqual(3);
    });

    it('should throw error for strings with different lengths', () => {
      expect(() =>
        calculateDistance(hammingDistance, 'karolin', 'kathrine'),
      ).toThrowError(
        'Strings must have equal length for Hamming distance calculation.',
      );
    });
  });
});