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Stacks

7 min · Ruby examples

Last-in-first-out structure for matching brackets, undo logic, and monotonic scans.

Examples in:PythonJavaScriptTypeScriptJavaC++CC#KotlinGoOCamlRubyPHPDartElixirRustScalaSwift
Ruby · Stacks0/5 cleared

Enemy 1 of 5

A stack is like a pile of plates: you push on top and pop from the top. Ruby arrays work great — push to push, pop to pop.

Classic use: walk a string of brackets and push opens; on a close, pop and check they match.

You
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Ln 1, Col 1Spaces: 4
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