indexBy() function

给定生成键的 f,将对象列表转换为按给定键索引对象的对象。注意,如果多个对象为索引键生成相同的值,则生成的对象中只包含最后一个值。

Signature:

declare function indexBy<A extends Key>(
  f: (a: A) => A,
  iterable: Iterable<A>,
): {
  [K in A]: K;
};

Example

const given = [
  { category: "clothes", desc: "good" },
  { category: "pants", desc: "bad" },
  { category: "shoes", desc: "not bad" },
];

indexBy((a) => a.category, given);
// {
//   clothes: { category: "clothes", desc: "good" },
//   pants: { category: "pants", desc: "bad" },
//   shoes: { category: "shoes", desc: "not bad" },
// };

Try It

Open Source Code