Module object/keyBy

keyBy

• keyBy<O, KT>(fn: ObjBaseBy<O, KT>, obj: O): Record<KT, O[keyof O]>
• keyBy<K, V, KT>(fn: ObjBase<K, V, KT>): <O>(obj: O) => Record<KT, O[keyof O]>

• Creates an object composed of keys generated from the results of running each element of object thru fn. The corresponding value of each key is the last element responsible for generating the key

  example

   keyBy(x => x < 2, { a: 0, b: 1, c: 3});//=> { false: 1, true: 3 }
  

  Type parameters

  • O

  • KT: string

  Parameters

  • fn: ObjBaseBy<O, KT>

    The function to transform value to group key. Receives three argument, value, key, obj.

  • obj: O

    The obj to iterate over.

  Returns Record<KT, O[keyof O]>

  Returns the composed aggregate object.

• Creates an object composed of keys generated from the results of running each element of object thru fn. The corresponding value of each key is the last element responsible for generating the key

  example

   keyBy(x => x < 2, { a: 0, b: 1, c: 3});//=> { false: 1, true: 3 }
  

  Type parameters

  • K: string | number | symbol

  • V

  • KT: string

  Parameters

  • fn: ObjBase<K, V, KT>

    The function to transform value to group key. Receives three argument, value, key, obj.

  Returns <O>(obj: O) => Record<KT, O[keyof O]>

  Returns the composed aggregate object.

  • • <O>(obj: O): Record<KT, O[keyof O]>

    • Type parameters

      • O: Record<K, V>

      Parameters

      • obj: O

      Returns Record<KT, O[keyof O]>