Module "operators/throw-if"

throwIf

• throwIf<T>(conditionFn: (value: T, index: number) => boolean, errorFn: (value: T, index: number) => any): (Anonymous function)

• Throws the error built by errorFn if conditionFn evaluates to be truthy.

  example

  const input = cold('   ft', { f: false, t: true });
  const expected = cold('f#', { f: false }, 'error');
  
  const result = input.pipe(
    // will throw 'error' for values === true
    throwIf(
      (val) => val
      () => error
    )
  );

  Type parameters

  • T

  Parameters

  • conditionFn: (value: T, index: number) => boolean

    Determines if an error should be thrown.

    • • (value: T, index: number): boolean

      • Parameters

        • value: T

        • index: number

        Returns boolean

  • errorFn: (value: T, index: number) => any

    Evaluates to the error which can be thrown.

    • • (value: T, index: number): any

      • Parameters

        • value: T

        • index: number

        Returns any

  Returns (Anonymous function)