Private stackThe pop function in TypeScript removes and returns the top element of a stack, or returns
undefined if the stack is empty.
The pop() method is being called on the stack array, which removes and returns the
last element of the array. The method returns the removed element of type T or undefined if
the array is empty.
The push function adds an item to the stack in TypeScript.
The item parameter represents the element that you want to push onto the
stack.
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The
isEmptyfunction in TypeScript checks if a stack is empty and returns a boolean value.