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Function: unwrapOrElse()

Call Signature​

unwrapOrElse<T>(option, fn): T

Defined in: option/unwrap/index.ts:99

Extracts the value from an Option or computes a default.

If the Option is Some, returns the value. If the Option is None, calls the function to compute a default.

Use this when the default value is expensive to compute.

Type Parameters​

T​

T

Parameters​

option​

Option<T>

The Option to unwrap

fn​

() => T

Function to compute default value

Returns​

T

The value or computed default

Example​

// Data-first
unwrapOrElse(some(42), () => expensiveComputation()) // => 42
unwrapOrElse(none(), () => expensiveComputation()) // => computed value

// Data-last (in pipe)
pipe(
  config.get('timeout'),
  unwrapOrElse(() => DEFAULT_TIMEOUT)
)

See​

  • unwrapOr - for simple default values
  • unwrap - for throwing on None

Call Signature​

unwrapOrElse<T>(fn): (option) => T

Defined in: option/unwrap/index.ts:100

Extracts the value from an Option or computes a default.

If the Option is Some, returns the value. If the Option is None, calls the function to compute a default.

Use this when the default value is expensive to compute.

Type Parameters​

T​

T

Parameters​

fn​

() => T

Function to compute default value

Returns​

The value or computed default

(option): T

Parameters​

option​

Option<T>

Returns​

T

Example​

// Data-first
unwrapOrElse(some(42), () => expensiveComputation()) // => 42
unwrapOrElse(none(), () => expensiveComputation()) // => computed value

// Data-last (in pipe)
pipe(
  config.get('timeout'),
  unwrapOrElse(() => DEFAULT_TIMEOUT)
)

See​

  • unwrapOr - for simple default values
  • unwrap - for throwing on None