Module object/findKey

findKey

• findKey<O>(fn: ObjPred<keyof O, O[keyof O]>, obj: O): void | keyof O
• findKey<K, V>(fn: ObjPred<K, V>): <O>(obj: O) => void | keyof O

• Returns first key in obj satisfied to fn, or undefined if there is no such keys

  example

   findKey(identity, {a: 0, b: 3}) //=> 'b'
   findKey(x => x > 3, { a: 2, b: 1 }) //=> undefined
   findKey(x => x > 3, { a: 4, b: 5 }) //=> 'a'
  

  Type parameters

  • O: Record<any, any>

  Parameters

  • fn: ObjPred<keyof O, O[keyof O]>

    Receives three argument, value, key, obj

  • obj: O

  Returns void | keyof O

• Returns first key in obj satisfied to fn, or undefined if there is no such keys

  example

   findKey(identity, {a: 0, b: 3}) //=> 'b'
   findKey(x => x > 3, { a: 2, b: 1 }) //=> undefined
   findKey(x => x > 3, { a: 4, b: 5 }) //=> 'a'
  

  Type parameters

  • K: string

  • V

  Parameters

  • fn: ObjPred<K, V>

    Receives three argument, value, key, obj

  Returns <O>(obj: O) => void | keyof O

  • • <O>(obj: O): void | keyof O

    • Type parameters

      • O: Record<K, V>

      Parameters

      • obj: O

      Returns void | keyof O