How To Type Array.reduce

Matt PocockMatt is a well-regarded TypeScript expert known for his ability to demystify complex TypeScript concepts. There's a common issue that comes up whenever you try to use Array.reduce to transform an array into an object. Learning how to fix it can teach you a lot about how to handle Array.reduce in general. Here's a playground: see if you can fix the error in the code below. #Why Is The Er

[jay-es]

reduce の初期値に空オブジェクトなどを指定した際のエラー回避方法は次の3通り。2つめの引数に as をつける、コールバック関数のパラメーターに型注釈をつける、reduce 自体に型引数をつける