Gist 512325

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✓ Published0🌍 Public

Last edited Aug 7, 2010

Created on Aug 7, 2010

This visualization demonstrates string-matching helper methods in Ruby, extending the `String` class with `starts_with?` and `ends_with?` predicates. The code defines these methods dynamically via `define_method`, checking if the beginning or end of a string equals a given substring. Each method slices the string using `self[0, other.length]` or `self[-1 * other.length, other.length]`, then compares the result with `==`. The `unless defined?(:starts_with?)` guard prevents redefinition, ensuring idempotent behavior. This example shows a pattern for augmenting core classes with custom query methods, relying on Ruby’s built-in string indexing and length arithmetic.

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