Web Reference: Master every Ruby array method with practical examples. Covers creating, accessing, searching, transforming, sorting, and iterating arrays plus performance tips and common idioms. Oct 14, 2012 · Good explanation of creating a 2D array but I does not seem to answer the second part of the question about iterating the 2D array. Currently, the full answer means you should read both this and simonmenke answers - which may be confusing. Arrays are ordered, integer-indexed collections of any object. Array indexing starts at 0, as in C or Java. A negative index is assumed to be relative to the end of the array—that is, an index of -1 indicates the last element of the array, -2 is the next to last element in the array, and so on.
YouTube Excerpt: Ruby's Intro to 2D Arrays
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