Web Reference: This lesson introduces the concept of stacks as a Last-In, First-Out (LIFO) data structure and demonstrates how to implement and manipulate stacks using Ruby's Array class. Ruby just gives us the convenience of using arrays for queue- and stack-like operations. And this convenience comes with the price of a higher space or time complexity. Ruby 2.5.0 Ruby 2.5.0 New to Ruby? You may find these links helpful: syntax, control expressions, assignment, methods, modules + classes, and operator precedence. This is the API documentation for Ruby 2.5.0.
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