isSomeOption()

isSomeOption<A>(fa): fa is { _tag: "Some"; value: A }

Validates if a value is a valid Option type with Some tag.

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Type Parameters

A: A

The value type.

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Parameters

fa: #### _tag: "Some" | "None"

The value to validate.

value?: A

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Returns: fa is { _tag: "Some"; value: A }

True if the value is a valid Some Option.

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Since

2.0.0

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Example

if (isSomeOption(fa)) {
  return E.right(fa.value!);
}
return E.left(onNone());