#Function: isFailure()

import { 
import ResultResult } from '@praha/byethrow';

const 
const result: Result.Result<number, string>result: 
import ResultResult.
type Result<T, E> = Result.Success<T> | Result.Failure<E>
A union type representing either a success or a failure.
@typeParamT  - The type of the Success value.@typeParamE  - The type of the Failure value.@example
import { Result } from '@praha/byethrow';

const doSomething = (): Result.Result<number, string> => {
  return Math.random() > 0.5
    ? { type: 'Success', value: 10 }
    : { type: 'Failure', error: 'Oops' };
};
@categoryCore  TypesResult<number, string> = { 
type: "Failure"type: 'Failure', 
error: stringerror: 'Something went wrong' };
if (
import ResultResult.
const isFailure: <Result.Failure<string>>(result: Result.Failure<string>) => result is Result.Failure<string>
Type guard to check if a
Result
is a
Failure 
.
@function@typeParamR  - The type of the result to check.@paramresult  - The Result to check.@returnstrue if the result is a Failure , otherwise false.@example
import { Result } from '@praha/byethrow';

const result: Result.Result<number, string> = { type: 'Failure', error: 'Something went wrong' };
if (Result.isFailure(result)) {
  console.error(result.error); // Safe access to error
}
@categoryType  GuardsisFailure(
const result: Result.Failure<string>result)) {
  
var console: Consoleconsole.
Console.error(...data: any[]): void
The console.error() static method outputs a message to the console at the "error" log level. The message is only displayed to the user if the console is configured to display error output. In most cases, the log level is configured within the console UI. The message may be formatted as an error, with red colors and call stack information.
MDN Referenceerror(
const result: Result.Failure<string>result.
error: stringerror); // Safe access to error
}