Create a concrete plan to replace one repeated scan with an appropriate membership or key lookup structure.
Replace one accidental linear membership scan in code, script, or notebook Choose a real collection path where a loop repeatedly asks whether an ID, email, SKU, or feature key exists in another collection. Data-structure commitment Target function or script: [file/function] Current repeated scan: [what collection is scanned inside what loop] Real operation: [membership yes/no OR key-to-value lookup] New structure: [set of keys OR dictionary from key to value] Key rule: [what makes the key unique and stable] Correctness test: [missing key, duplicate key, and one normal match] Done when: [PR, ticket, or notebook cell shows before/after behavior] Did you replace…
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