Module array/indexBy

indexBy

• indexBy<T>(fn: Pred<T>, list: ArrayLike<T>): Record<string, T>
• indexBy<T>(fn: Pred<T>): (list: ArrayLike<T>) => Record<string, T>

• Given a function that generates a key, turns a list of objects into an object indexing the objects by the given key. Note that if multiple objects generate the same value for the indexing key only the last value will be included in the generated object.

  example

   var list = [{id: 'xyz', title: 'A'}, {id: 'abc', title: 'B'}];
   indexBy(x => x.id, list);
   //=> {abc: {id: 'abc', title: 'B'}, xyz: {id: 'xyz', title: 'A'}}
  

  Type parameters

  • T

  Parameters

  • fn: Pred<T>

    Function :: a -> String

  • list: ArrayLike<T>

  Returns Record<string, T>

  An object indexing each array element by the given property.

• Given a function that generates a key, turns a list of objects into an object indexing the objects by the given key. Note that if multiple objects generate the same value for the indexing key only the last value will be included in the generated object.

  example

   var list = [{id: 'xyz', title: 'A'}, {id: 'abc', title: 'B'}];
   indexBy(x => x.id, list);
   //=> {abc: {id: 'abc', title: 'B'}, xyz: {id: 'xyz', title: 'A'}}
  

  Type parameters

  • T

  Parameters

  • fn: Pred<T>

    Function :: a -> String

  Returns (list: ArrayLike<T>) => Record<string, T>

  An object indexing each array element by the given property.

  • • (list: ArrayLike<T>): Record<string, T>

    • Parameters

      • list: ArrayLike<T>

      Returns Record<string, T>