Дмитрий Беляев

│   main.js
└───lib
        greeting.ts

import { greeting } from './lib/greeting.js';

console.log(greeting('John'));

export const greeting = (name: string): string => `Hello, ${name}`;

export const greeting = (name) => `Hello, ${name}`;

export declare const greeting: (name: string) => string;

export declare class Message {
    send(t: string, f: string): void;
}

возникла проблема со скоростью выполнения кода

function partsSums(ls) {
  const result = new Array(ls.length + 1);
  result[ls.length] = 0;

  for (let i = ls.length - 1; i > -1; i--) {
    result[i] = result[i + 1] + ls[i];
  }

  return result;
}

const elementDefaults = {
  'welcome': {
    placeholder: 'Type welcome message...',
    question: '',
    isDescription: false,
    description: '',
    startButtonText: 'Start',
  },
  'checkbox': {
    placeholder: 'Type question or statement...',
    question: '',
    isDescription: false,
    description: '',
    options: [] as string[],
    multiple: false,
  }, 
  'dropdown': {
    placeholder: 'Type question here...',
    question: '',
    isDescription: false,
    description: '',
    options: [] as string[],
  },
  'rating': {
    placeholder: 'Type question...',
    question: '',
    isDescription: false,
    description: '',
    steps: 10,
    defaultRate: 0,
    shape: 'stars',
  },
  'text': {
    placeholder: 'Type question...',
    question: '',
    isDescription: false,
    description: '',
    maxLength: 99999,
  }, 
  'slider': {
    placeholder: 'Type question...',
    question: '',
    isDescription: false,
    description: '',
    steps: 10,
  }, 
  'thanks': {
    placeholder: 'Type message...',
    question: '',
    isDescription: false,
    description: '',
  }
}


export function getElementSettings<E extends keyof typeof elementTypes>(type: E) {
  if(!(type in elementDefaults)) throw new Error("element type doesn't match!");
  return elementDefaults[type];
}

type ElementSetting = {
  placeholder: string;
  question: string;
  isDescription: boolean;
  description: string;
}

type ElementSettings = {
  welcome: ElementSetting & {
    startButtonText: string;
  },
  checkbox: ElementSetting & {
    options: string[];
    multiple: boolean;
  },
  dropdown: ElementSetting & {
    options: string[];
  },
  rating: ElementSetting & {
    steps: number;
    defaultRate: number;
    shape: string;
  },
  text: ElementSetting & {
    maxLength: number;
  },
  slider: ElementSetting & {
    steps: number;
  },
  thanks: ElementSetting
}

const elementDefaults: ElementSettings = {
  'welcome': {
    placeholder: 'Type welcome message...',
    question: '',
    isDescription: false,
    description: '',
    startButtonText: 'Start',
  },
  'checkbox': {
    placeholder: 'Type question or statement...',
    question: '',
    isDescription: false,
    description: '',
    options: [],
    multiple: false,
  },
  'dropdown': {
    placeholder: 'Type question here...',
    question: '',
    isDescription: false,
    description: '',
    options: [],
  },
  'rating': {
    placeholder: 'Type question...',
    question: '',
    isDescription: false,
    description: '',
    steps: 10,
    defaultRate: 0,
    shape: 'stars',
  },
  'text': {
    placeholder: 'Type question...',
    question: '',
    isDescription: false,
    description: '',
    maxLength: 99999,
  },
  'slider': {
    placeholder: 'Type question...',
    question: '',
    isDescription: false,
    description: '',
    steps: 10,
  },
  'thanks': {
    placeholder: 'Type message...',
    question: '',
    isDescription: false,
    description: '',
  }
}


export function getElementSettings<E extends keyof ElementSettings>(type: E): ElementSettings[E] {
  if(!(type in elementDefaults)) throw new Error("element type doesn't match!");
  return elementDefaults[type];
}

Как наиболее короче сделать...

generalDiv.innerHTML = newCats
  .filter(n => n?.breeds.length)
  .map(({ url, breeds: [ b ] }) => `
    <div class="cat__item">
      <div class="cat__img"><img src="${url}" alt="${b.name}"></div>
      <div class="cat__name">${b.name}</div>
      <div class="cat__temperament">${b.temperament}</div>
      <div class="cat__live">${b.life_span}</div>
      <div class="cat__origin">${b.origin}</div>
      <div class="cat__description">${b.description}</div>
      <div class="cat__wikipedia_url">${b.wikipedia_url}</div>
    </div>
  `)
  .join('');

const arr = [{a:5},{d:6},{g:0},{b:3},{c:1}];
let max = null;
let result;

for (const currentObj of arr) {
  const currentValue = currentObj[Object.keys(currentObj)[0]];
  const currentKey = Object.keys(currentObj)[0];

  if (max < currentObj[currentKey] || max === null) {
    max = currentValue;
    result = currentKey;
  }
}
console.log(result);

Такая обертка нужна для ajax