feat: implement TypeScript typing

src/homeworks/ts1/1_base.test.js

@@ -1,26 +1,21 @@
-// Этот блок кода удалить и раскомментировать код ниже
-it('remove it', () => {
-  expect(true).toBe(true);
-});
+import { transformCustomers } from './1_base';
+
+describe('all', () => {
+  it('transformCustomers', () => {
+    const customers = [
+      { id: 1, name: 'John', age: 25, isSubscribed: true },
+      { id: 2, name: 'Mary', age: 40, isSubscribed: false },
+      { id: 3, name: 'Bob', age: 32, isSubscribed: true },
+      { id: 4, name: 'Alice', age: 22, isSubscribed: true },
+      { id: 5, name: 'David', age: 48, isSubscribed: false },
+    ];
 
-// import { transformCustomers } from './1_base';
-//
-// describe('all', () => {
-//   it('transformCustomers', () => {
-//     const customers = [
-//       { id: 1, name: 'John', age: 25, isSubscribed: true },
-//       { id: 2, name: 'Mary', age: 40, isSubscribed: false },
-//       { id: 3, name: 'Bob', age: 32, isSubscribed: true },
-//       { id: 4, name: 'Alice', age: 22, isSubscribed: true },
-//       { id: 5, name: 'David', age: 48, isSubscribed: false },
-//     ];
-//
-//     expect(transformCustomers(customers)).toEqual({
-//       1: { name: 'John', age: 25, isSubscribed: true },
-//       2: { name: 'Mary', age: 40, isSubscribed: false },
-//       3: { name: 'Bob', age: 32, isSubscribed: true },
-//       4: { name: 'Alice', age: 22, isSubscribed: true },
-//       5: { name: 'David', age: 48, isSubscribed: false },
-//     });
-//   });
-// });
+    expect(transformCustomers(customers)).toEqual({
+      1: { name: 'John', age: 25, isSubscribed: true },
+      2: { name: 'Mary', age: 40, isSubscribed: false },
+      3: { name: 'Bob', age: 32, isSubscribed: true },
+      4: { name: 'Alice', age: 22, isSubscribed: true },
+      5: { name: 'David', age: 48, isSubscribed: false },
+    });
+  });
+});

src/homeworks/ts1/1_base.ts

@@ -0,0 +1,92 @@
+/**
+ * Нужно превратить файл в ts и указать типы аргументов и типы возвращаемого значения
+ * */
+export const removePlus = (string: string): string => string.replace(/^\+/, '');
+
+export const addPlus = (string: string): string => `+${string}`;
+
+export const removeFirstZeros = (value: string): string => value.replace(/^(-)?[0]+(-?\d+.*)$/, '$1$2');
+
+export const getBeautifulNumber = (value: number | string, separator = ' '): string =>
+  value.toString().replace(/\B(?=(\d{3})+(?!\d))/g, separator);
+
+export const round = (value: number, accuracy = 2): number => {
+  const d = 10 ** accuracy;
+  return Math.round(value * d) / d;
+};
+
+type TransformPoint = {
+  x: number;
+  y: number;
+};
+
+const transformRegexp =
+  /(matrix\(-?\d+(\.\d+)?, -?\d+(\.\d+)?, -?\d+(\.\d+)?, -?\d+(\.\d+)?, )(-?\d+(\.\d+)?), (-?\d+(\.\d+)?)\)/;
+
+export const getTransformFromCss = (transformCssString: string): TransformPoint => {
+  const data = transformCssString.match(transformRegexp);
+  if (!data) return { x: 0, y: 0 };
+  return {
+    x: parseInt(data[6], 10),
+    y: parseInt(data[8], 10),
+  };
+};
+
+export const getColorContrastValue = ([red, green, blue]: [number, number, number]): number =>
+  // http://www.w3.org/TR/AERT#color-contrast
+  Math.round((red * 299 + green * 587 + blue * 114) / 1000);
+
+export const getContrastType = (contrastValue: number): 'black' | 'white' =>
+  contrastValue > 125 ? 'black' : 'white';
+
+export const shortColorRegExp = /^#[0-9a-f]{3}$/i;
+export const longColorRegExp = /^#[0-9a-f]{6}$/i;
+
+export type HexColor = string;
+
+export function checkColor(color: string): asserts color is HexColor {
+  if (!longColorRegExp.test(color) && !shortColorRegExp.test(color)) {
+    throw new Error(`invalid hex color: ${color}`);
+  }
+}
+
+export const hex2rgb = (color: string): [number, number, number] => {
+  checkColor(color);
+  if (shortColorRegExp.test(color)) {
+    const red = parseInt(color.substring(1, 2), 16);
+    const green = parseInt(color.substring(2, 3), 16);
+    const blue = parseInt(color.substring(3, 4), 16);
+    return [red, green, blue];
+  }
+  const red = parseInt(color.substring(1, 3), 16);
+  const green = parseInt(color.substring(3, 5), 16);
+  const blue = parseInt(color.substring(5, 8), 16);
+  return [red, green, blue];
+};
+
+type NumberedItem<T> = {
+  value: T;
+  number: number;
+};
+
+export const getNumberedArray = <T>(arr: T[]): NumberedItem<T>[] =>
+  arr.map((value, number) => ({ value, number }));
+
+export const toStringArray = <T>(arr: NumberedItem<T>[]): string[] =>
+  arr.map(({ value, number }) => `${value}_${number}`);
+
+type Customer = {
+  id: number;
+  name: string;
+  age: number;
+  isSubscribed: boolean;
+};
+
+type TransformedCustomers = Record<number, { name: string; age: number; isSubscribed: boolean }>;
+
+export const transformCustomers = (customers: Customer[]): TransformedCustomers => {
+  return customers.reduce<TransformedCustomers>((acc, customer) => {
+    acc[customer.id] = { name: customer.name, age: customer.age, isSubscribed: customer.isSubscribed };
+    return acc;
+  }, {});
+};

src/homeworks/ts1/2_repair.ts

@@ -2,46 +2,53 @@
  * Здесь код с ошибками типов. Нужно их устранить
  * */
 
-// // Мы это не проходили, но по тексту ошибки можно понять, как это починить
-// export const getFakeApi = async (): void => {
-//   const result = await fetch('https://jsonplaceholder.typicode.com/todos/1').then((response) => response.json());
-//   console.log(result);
-// };
-//
-// // Мы это не проходили, но по тексту ошибки можно понять, как это починить
-// export class SomeClass {
-//   constructor() {
-//     this.set = new Set([1]);
-//     this.channel = new BroadcastChannel('test-broadcast-channel');
-//   }
-// }
-//
-// export type Data = {
-//   type: 'Money' | 'Percent';
-//   value: DataValue;
-// };
-//
-// export type DataValue = Money | Percent;
-//
-// export type Money = {
-//   currency: string;
-//   amount: number;
-// };
-//
-// export type Percent = {
-//   percent: number;
-// };
-//
-// // Здесь, возможно, нужно использовать as, возможно в switch передавать немного по-другому
-// const getDataAmount = (data: Data): number => {
-//   switch (data.type) {
-//     case 'Money':
-//       return data.value.amount;
-//
-//     default: {
-//       // eslint-disable-next-line @typescript-eslint/no-unused-vars
-//       const unhandled: never = data; // здесь, возможно, нужно использовать нечто другое. :never должен остаться
-//       throw new Error(`unknown type: ${data.type}`);
-//     }
-//   }
-// };
+// Мы это не проходили, но по тексту ошибки можно понять, как это починить
+export const getFakeApi = async (): Promise<void> => {
+  const result = await fetch('https://jsonplaceholder.typicode.com/todos/1').then((response) => response.json());
+  console.log(result);
+};
+
+// Мы это не проходили, но по тексту ошибки можно понять, как это починить
+export class SomeClass {
+  set: Set<number>;
+
+  channel: BroadcastChannel;
+
+  constructor() {
+    this.set = new Set([1]);
+    this.channel = new BroadcastChannel('test-broadcast-channel');
+  }
+}
+
+export type Money = {
+  currency: string;
+  amount: number;
+};
+
+export type Percent = {
+  percent: number;
+};
+
+export type DataValue = Money | Percent;
+
+export type Data = {
+  type: 'Money' | 'Percent';
+  value: DataValue;
+};
+
+// Здесь, возможно, нужно использовать as, возможно в switch передавать немного по-другому
+const getDataAmount = (data: Data): number => {
+  switch (data.type) {
+    case 'Money':
+      return (data.value as Money).amount;
+
+    case 'Percent':
+      throw new Error(`unknown type: ${data.type}`);
+
+    default: {
+      // eslint-disable-next-line @typescript-eslint/no-unused-vars
+      const unhandled: never = data.type;
+      throw new Error(`unknown type: ${unhandled}`);
+    }
+  }
+};

src/homeworks/ts1/3_write.test.js

@@ -1,35 +1,30 @@
-// Этот блок кода удалить и раскомментировать код ниже
-it('remove it', () => {
-  expect(true).toBe(true);
-});
+import { createRandomOperation, createRandomProduct } from './3_write';
+
+describe('all', () => {
+  it('operation', () => {
+    const createdAt = '2023-06-06T12:06:56.957Z';
+    const operation = createRandomOperation(createdAt);
+    expect(operation).toHaveProperty('createdAt', createdAt);
+    expect(operation).toHaveProperty('id');
+    expect(operation).toHaveProperty('name');
+    expect(operation).toHaveProperty('desc');
+    expect(operation).toHaveProperty('createdAt');
+    expect(operation).toHaveProperty('amount');
+    expect(operation).toHaveProperty('category');
+    expect(operation).toHaveProperty('type');
+  });
 
-// import { createRandomOperation, createRandomProduct } from './3_write';
-//
-// describe('all', () => {
-//   it('operation', () => {
-//     const createdAt = '2023-06-06T12:06:56.957Z';
-//     const operation = createRandomOperation(createdAt);
-//     expect(operation).toHaveProperty('createdAt', createdAt);
-//     expect(operation).toHaveProperty('id');
-//     expect(operation).toHaveProperty('name');
-//     expect(operation).toHaveProperty('desc');
-//     expect(operation).toHaveProperty('createdAt');
-//     expect(operation).toHaveProperty('amount');
-//     expect(operation).toHaveProperty('category');
-//     expect(operation).toHaveProperty('type');
-//   });
-//
-//   it('product', () => {
-//     const createdAt = '2023-06-06T12:06:56.957Z';
-//     const product = createRandomProduct(createdAt);
-//     expect(product).toHaveProperty('createdAt', createdAt);
-//     expect(product).toHaveProperty('id');
-//     expect(product).toHaveProperty('name');
-//     expect(product).toHaveProperty('photo');
-//     expect(product).toHaveProperty('desc');
-//     expect(product).toHaveProperty('createdAt');
-//     expect(product).toHaveProperty('oldPrice');
-//     expect(product).toHaveProperty('price');
-//     expect(product).toHaveProperty('category');
-//   });
-// });
+  it('product', () => {
+    const createdAt = '2023-06-06T12:06:56.957Z';
+    const product = createRandomProduct(createdAt);
+    expect(product).toHaveProperty('createdAt', createdAt);
+    expect(product).toHaveProperty('id');
+    expect(product).toHaveProperty('name');
+    expect(product).toHaveProperty('photo');
+    expect(product).toHaveProperty('desc');
+    expect(product).toHaveProperty('createdAt');
+    expect(product).toHaveProperty('oldPrice');
+    expect(product).toHaveProperty('price');
+    expect(product).toHaveProperty('category');
+  });
+});