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Function: isNone()

isNone<T>(option): option is None

Defined in: option/guards/index.ts:41

Type guard to check if an Option is None.

Narrows the type to None.

Type Parameters​

T​

T

Parameters​

option​

Option<T>

The Option to check

Returns​

option is None

True if the Option is None

Example​

const opt = none()

if (isNone(opt)) {
  console.log('No value present')
}