Methods
hasNext() → {boolean}
    Checks if the stack isn't empty.
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Returns:
- Type:
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boolean
    Whether or not the stack has another element. True if yes.
    
isEmpty() → {boolean}
    Checks if the stack is empty.
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Returns:
- Type:
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boolean
    Whether or not the stack is empty. True if yes.
    
peek() → {object}
    Get the front element of the stack without removing it from the stack.
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Returns:
- Type:
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object
    Front element from the stack.
    
pop() → {object}
    Get the front element of the stack and removes it from the stack.
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Returns:
- Type:
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object
    Front element from the stack.
    
push(obj)
    Push an object in to the stack.
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Parameters:
| Name | Type | Description | 
|---|---|---|
| obj | object | Any object to be pushed into the stack. | 
size() → {number}
    Get the number of objects in the stack.
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Returns:
- Type:
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number
    Number of elements in the stack.