peek

public T+ peek()

The element at the top of the queue (earliest element added) or undefined if the queue was empty.

Returns the most earliest element added to the queue without removing it. If the queue is empty, undefined will be returned.

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import System;   auto queue = new Queue<int>([ 1, 2 ]); Console.log(queue.peek()); // 1 Console.log(queue.peek()); // 1