Javascript 常见问题

柯里化

‌函数柯里化（Currying）是一种将接受多个参数的函数转换为接受单个参数的函数的技术。

const curry = <T extends (...args: any[]) => any>(fn: T): CurryFunction<T> => {
  let args: any[] = [];
  return function curryFunction(this: any, arg: any) {
    args.push(arg);
    if (args.length >= fn.length) return fn.apply(this, args);
    return curryFunction;
  } as CurryFunction<T>;
};

type CurryFunction<T extends (...args: any[]) => any> = T extends (
  ...args: infer P
) => infer R
  ? P extends [infer F, ...infer Rest]
    ? (arg: F) => CurryFunction<(...args: Rest) => R>
    : R
  : never;

const a = curry((a: string, b: boolean, c: number): void => {
  console.log(a, b, c);
});

反柯里化

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