Cheatsheet Typescript

index.ts

const isArrayEmpty = (arr: unknown[]): boolean => Array.isArray(arr) && !arr.length;

const capitalize = (s: string): string => s.charAt(0).toUpperCase() + s.slice(1);

const isObjectEmpty = (obj: unknown): boolean => obj && Object.keys(obj).length === 0;

const randomInteger = (min: number, max: number): number => Math.floor(Math.random() * (max - min + 1)) + min;

const clamp = (input: number, min: number, max: number): number => input < min ? min : input > max ? max : input

const map = (current: number, in_min: number, in_max: number, out_min: number, out_max: number): number => {
  const mapped: number = ((current - in_min) * (out_max - out_min)) / (in_max - in_min) + out_min;
  return clamp(mapped, out_min, out_max);
}