Day 17/60: Matrix operations
60 Day DSA in JavaScript Challenge
Today I focused on making matrix operations work with JavaScript strings, indexing, and character handling without losing correctness. The strongest checkpoints were decide early whether indexing, slices, or character arrays are the right representation in JavaScript, keep the transformation or scan state explicit instead of mixing index tricks together, and use string and array helpers deliberately so character handling does not become accidental.
The mistake I wanted to avoid was mixing index assumptions and character handling without checking what the string API actually returns. The day felt better once the invariant stayed visible and each update had one job.
The goal for tomorrow is simple: keep the rule clear enough that the next variation still feels related to the same idea. I also want to keep tracing tiny examples because they expose weak assumptions faster than large random tests.
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