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Is floating point math broken?（33答案）
26天前关闭

export class AppService {
  calculatePrice(books: Book[]): number {
    // The idea is to group a sets of books together
    if (books.length === 0) return 0;
    if (books.length === 1) return PRICE;

    const flatBooks = books.flat(2);
    const setOfBooks = [...new Set(flatBooks)];

    const cumulate = PRICE * setOfBooks.length * DISCOUNT[setOfBooks.length];
    // remove elements
    for (const book of setOfBooks) {
      const index = flatBooks.indexOf(book);
      flatBooks.splice(index, 1);
    }

    console.log(cumulate);

    return cumulate + this.calculatePrice(flatBooks);
  }
}

好吧，我做了一个递归函数的测试，但我得到了一个奇怪的情况。
而不是有184.4€的一组书的测试，我得到了184.39999999999999998
我用了一个加法和一个乘法，所以不可能得到这个价格所有细节都在下面
https://github.com/wajdibenabdallah/liberation-kata
只做clone然后pnpm i然后pnpm t