lib cheinAddFun.ts

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  // We want to create a function that will add numbers together when called in succession.
 
export default function add(x: number): any {
  const fn = (y: number) => add(x + y);
  fn.valueOf = () => x;
  return fn;
}
 
const seven = add(1)(2)(4);
console.log(seven == 7, 'expect 7')
 
console.log(+add(1)(2), 'expect 3')