HomeWork

HomeWork.ts

// LTR
const pipe = (...fns: Function[]) => (x: any) => fns.reduce((res, fn) => fn(res), x);

// RTL
const compose = (...fns: Function[]) => (x: any) => fns.reduceRight((res, fn) => fn(res), x);


///////////////// Word Counter /////////////////////////////////////////////////////////

const text: string = " Hi, this is an Advanced !? 'text'\r\nAnother Line a \t b c a-a bc-d +.';";

// removes whitespace from both ends of a string
const trimText = (text: string) => text.trim();

// spaces delimit words
const splitText = (text: string) => text.split(/\s+/);

// count text
const countText = (textarray: string[]) => textarray.length;

// compose 
const wordCount = compose(trimText, splitText, countText);

// print
console.log(wordCount(text));



///////////////// Basket /////////////////////////////////////////////////////////

interface Basket {
  basketId: string,
  userId: number,
  discount: number,
  productList: TempProduct[],
  productListPrice? : number
}

interface TempProduct {
  name: string,
  price: number,
  count: number
  discount: number,
}

const basket: Basket = {
  basketId: "",
  userId: 3321,
  discount: 500,
  productList: [ 
    { name: "phone", price: 500, count: 2, discount: 20 },
    { name: "tablet", price: 600, count: 3, discount: 30 }
  ]
}

// calculate total price of products in basket
const basketProductListPrice = (basket: Basket) => 
{
  basket.productListPrice! = basket.productList.reduce((previousProduct, currentProduct) => 
    previousProduct + ((currentProduct.price * currentProduct.count) - currentProduct.discount), 0)
  return basket
}

// calculate basket discount
const basketAfterDiscount = (basket: Basket) => basket.productListPrice! - basket.discount;

// compose 
const basketPrice = compose(basketProductListPrice, basketAfterDiscount);

// print
console.log(basketPrice(basket));