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A zipper is modelled as the sum type `type Tree = Empty | Branch`, with the path from the root to the current position kept as a list of steps that the example walks in both directions. Registers the exercise in config.json. Verified with bin/verify-exercises-in-docker (the current test runner image) and with V 0.5.2 for bin/test. configlet lint passes, and v fmt -l / v vet are clean on the new files.
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What
Adds the Zipper practice exercise (difficulty 4), split out of #307.
zipper.v— stub.meta/example.v— example solutionrun_test.v— 14 tests, built from the canonical data inproblem-specifications.meta/config.json,.meta/tests.toml,.docs/config.json— registers the exerciseA zipper is the sum type
type Tree = Empty | Branch, with the path from the root to the current position kept as a list of steps.One self-contained commit that touches nothing outside the exercise, so it can be merged on its own.
Verification
bin/verify-exercises-in-docker(the currentvlang-test-runnerimage, V 0.4.8): pass, 14/14 tests.vlang/setup-vinstalls forbin/testin CI: pass.configlet lintpasses;v fmt -landv vetare clean on the new files.For the merge commit
Not needed: a brand new exercise does not change the outcome of any existing exercise's tests.