- head<Iterable>(iterable: Iterable): Iterable extends ReadOnlyArray<unknown> ? Head<Iterable> : GeneratorOutput<Iterable>
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Type Parameters
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Iterable extends AsynchronousIterable<unknown>
Returns Iterable extends ReadOnlyArray<unknown> ? Head<Iterable> : GeneratorOutput<Iterable>
Get first element of an iterable or asynchronous iterable (
undefined
if it is empty).Example
Returns
First element of the iterable (
undefined
if empty).