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Guide
Examples
API Reference
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byethrow
@praha/byethrow

Modules

Result

Types

Type Alias: Failure<E>
Type Alias: InferFailure<T>
Type Alias: InferSuccess<T>
Type Alias: Result<T, E>
Type Alias: ResultAsync<T, E>
Type Alias: ResultFor<R, T, E>
Type Alias: ResultMaybeAsync<T, E>
Type Alias: Success<T>

Functions

Function: andThen()
Function: andThrough()
Function: assertFailure()
Function: assertSuccess()
Function: bind()
Function: combine()
Function: do()
Function: fail()
Function: inspect()
Function: inspectError()
Function: isFailure()
Function: isResult()
Function: isSuccess()
Function: map()
Function: mapError()
Function: orElse()
Function: parse()
Function: pipe()
Function: succeed()
Function: try()
Function: unwrap()
Function: unwrapError()

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#Function: isSuccess()

isSuccess<T>(result): result is Success<T>

Defined in: functions/is-success.ts:23

Type guard to check if a Result is a Success.

#Type Parameters

#T

T

The type of the success value.

#Parameters

#result

Result<T, unknown>

The Result to check.

#Returns

result is Success<T>

true if the result is a Success, otherwise false.

#Example

import { 
import Result
Result
} from '@praha/byethrow';
const
const result: Result.Result<number, string>
result
:
import Result
Result
.
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 Types
Result
<number, string> = {
type: "Success"
type
: 'Success',
value: number
value
: 10 };
if (
import Result
Result
.
const isSuccess: <number>(result: Result.Result<number, unknown>) => result is Result.Success<number>

Type guard to check if a Result is a Success .

@function@typeParamT - The type of the success value.@paramresult - The Result to check.@returnstrue if the result is a Success, otherwise false.@example
import { Result } from '@praha/byethrow';

const result: Result.Result<number, string> = { type: 'Success', value: 10 };
if (Result.isSuccess(result)) {
  console.log(result.value); // Safe access to value
}
@categoryType Guards
isSuccess
(
const result: Result.Success<number>
result
)) {
var console: Console

The console module provides a simple debugging console that is similar to the JavaScript console mechanism provided by web browsers.

The module exports two specific components:

  • A Console class with methods such as console.log(), console.error() and console.warn() that can be used to write to any Node.js stream.
  • A global console instance configured to write to process.stdout and process.stderr. The global console can be used without importing the node:console module.

Warning: The global console object's methods are neither consistently synchronous like the browser APIs they resemble, nor are they consistently asynchronous like all other Node.js streams. See the note on process I/O for more information.

Example using the global console:

console.log('hello world');
// Prints: hello world, to stdout
console.log('hello %s', 'world');
// Prints: hello world, to stdout
console.error(new Error('Whoops, something bad happened'));
// Prints error message and stack trace to stderr:
//   Error: Whoops, something bad happened
//     at [eval]:5:15
//     at Script.runInThisContext (node:vm:132:18)
//     at Object.runInThisContext (node:vm:309:38)
//     at node:internal/process/execution:77:19
//     at [eval]-wrapper:6:22
//     at evalScript (node:internal/process/execution:76:60)
//     at node:internal/main/eval_string:23:3

const name = 'Will Robinson';
console.warn(`Danger ${name}! Danger!`);
// Prints: Danger Will Robinson! Danger!, to stderr

Example using the Console class:

const out = getStreamSomehow();
const err = getStreamSomehow();
const myConsole = new console.Console(out, err);

myConsole.log('hello world');
// Prints: hello world, to out
myConsole.log('hello %s', 'world');
// Prints: hello world, to out
myConsole.error(new Error('Whoops, something bad happened'));
// Prints: [Error: Whoops, something bad happened], to err

const name = 'Will Robinson';
myConsole.warn(`Danger ${name}! Danger!`);
// Prints: Danger Will Robinson! Danger!, to err
@seesource
console
.
Console.log(message?: any, ...optionalParams: any[]): void (+1 overload)

Prints to stdout with newline. Multiple arguments can be passed, with the first used as the primary message and all additional used as substitution values similar to printf(3) (the arguments are all passed to util.format()).

const count = 5;
console.log('count: %d', count);
// Prints: count: 5, to stdout
console.log('count:', count);
// Prints: count: 5, to stdout

See util.format() for more information.

@sincev0 .1.100
log
(
const result: Result.Success<number>
result
.
value: number
value
); // Safe access to value
}