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Function: tryCatch()

Call Signature​

tryCatch<T>(fn): Result<T, unknown>

Defined in: result/constructors/index.ts:56

Wraps a potentially throwing function in a Result.

If the function executes successfully, returns Ok with the value. If it throws, returns Err with the error.

Type Parameters​

T​

T

Parameters​

fn​

() => T

Function that may throw

Returns​

Result<T, unknown>

Result containing either the return value or the error

Example​

const parseJSON = (str: string) =>
  tryCatch(() => JSON.parse(str))

parseJSON('{"name":"John"}')
// => Ok({ name: 'John' })

parseJSON('invalid json')
// => Err(SyntaxError: ...)

Call Signature​

tryCatch<T, E>(fn, mapError): Result<T, E>

Defined in: result/constructors/index.ts:78

Wraps a potentially throwing function in a Result with custom error mapping.

Type Parameters​

T​

T

E​

E

Parameters​

fn​

() => T

Function that may throw

mapError​

(error) => E

Function to transform the caught error

Returns​

Result<T, E>

Result containing either the return value or the mapped error

Example​

const parseNumber = (str: string) =>
  tryCatch(
    () => {
      const n = Number(str)
      if (Number.isNaN(n)) throw new Error('Invalid number')
      return n
    },
    (e) => `Parse error: ${e}`
  )