{
  "code": "DRY",
  "collection": "architecture",
  "href": "https://banes-lab.com/ontology#architecture-duplicate-code",
  "id": "duplicate-code",
  "kind": "principle",
  "layer": {
    "href": "https://banes-lab.com/ontology/schema#layer-structural-core",
    "json": "https://banes-lab.com/json/records/layer/structural-core",
    "label": "Structural Core",
    "markdown": "https://banes-lab.com/records/layer/structural-core.md",
    "ref": "layer:structural-core"
  },
  "name": "Do Not Repeat Yourself",
  "ref": "architecture:duplicate-code",
  "relations": [
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology#architecture-abstraction",
          "json": "https://banes-lab.com/json/records/architecture/abstraction",
          "label": "Abstraction",
          "markdown": "https://banes-lab.com/records/architecture/abstraction.md",
          "ref": "architecture:abstraction"
        },
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-canonical-source",
          "json": "https://banes-lab.com/json/records/lexicon/canonical-source",
          "label": "Canonical Source",
          "markdown": "https://banes-lab.com/records/lexicon/canonical-source.md",
          "ref": "lexicon:canonical-source"
        }
      ],
      "relation": "requires"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology#architecture-single-source-of-truth",
          "json": "https://banes-lab.com/json/records/architecture/single-source-of-truth",
          "label": "Single Source of Truth",
          "markdown": "https://banes-lab.com/records/architecture/single-source-of-truth.md",
          "ref": "architecture:single-source-of-truth"
        },
        {
          "href": "https://banes-lab.com/ontology#architecture-reusability",
          "json": "https://banes-lab.com/json/records/architecture/reusability",
          "label": "Reusability",
          "markdown": "https://banes-lab.com/records/architecture/reusability.md",
          "ref": "architecture:reusability"
        }
      ],
      "relation": "reinforces"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology#architecture-consistency",
          "json": "https://banes-lab.com/json/records/architecture/consistency",
          "label": "Consistency",
          "markdown": "https://banes-lab.com/records/architecture/consistency.md",
          "ref": "architecture:consistency"
        },
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-maintainability",
          "json": "https://banes-lab.com/json/records/lexicon/maintainability",
          "label": "Maintainability",
          "markdown": "https://banes-lab.com/records/lexicon/maintainability.md",
          "ref": "lexicon:maintainability"
        }
      ],
      "relation": "enables"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-copy-paste-programming",
          "json": "https://banes-lab.com/json/records/lexicon/copy-paste-programming",
          "label": "Copy-Paste Programming",
          "markdown": "https://banes-lab.com/records/lexicon/copy-paste-programming.md",
          "ref": "lexicon:copy-paste-programming"
        }
      ],
      "relation": "conflicts-with"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-locality-of-behavior",
          "json": "https://banes-lab.com/json/records/lexicon/locality-of-behavior",
          "label": "Locality of Behavior",
          "markdown": "https://banes-lab.com/records/lexicon/locality-of-behavior.md",
          "ref": "lexicon:locality-of-behavior"
        },
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-simplicity",
          "json": "https://banes-lab.com/json/records/lexicon/simplicity",
          "label": "Simplicity",
          "markdown": "https://banes-lab.com/records/lexicon/simplicity.md",
          "ref": "lexicon:simplicity"
        }
      ],
      "relation": "tensions-with"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology/schema#tension-do-not-repeat-yourself-dry-locality-of-behavior",
          "json": "https://banes-lab.com/json/records/tension/do-not-repeat-yourself-dry-locality-of-behavior",
          "label": "Do Not Repeat Yourself (DRY) / Locality of Behavior",
          "markdown": "https://banes-lab.com/records/tension/do-not-repeat-yourself-dry-locality-of-behavior.md",
          "ref": "tension:do-not-repeat-yourself-dry-locality-of-behavior"
        },
        {
          "href": "https://banes-lab.com/ontology/schema#tension-do-not-repeat-yourself-dry-simplicity",
          "json": "https://banes-lab.com/json/records/tension/do-not-repeat-yourself-dry-simplicity",
          "label": "Do Not Repeat Yourself (DRY) / Simplicity",
          "markdown": "https://banes-lab.com/records/tension/do-not-repeat-yourself-dry-simplicity.md",
          "ref": "tension:do-not-repeat-yourself-dry-simplicity"
        }
      ],
      "relation": "tensions"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-copy-paste-programming",
          "json": "https://banes-lab.com/json/records/lexicon/copy-paste-programming",
          "label": "Copy-Paste Programming",
          "markdown": "https://banes-lab.com/records/lexicon/copy-paste-programming.md",
          "ref": "lexicon:copy-paste-programming"
        }
      ],
      "relation": "violated-by"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-extract-function",
          "json": "https://banes-lab.com/json/records/lexicon/extract-function",
          "label": "Extract Function",
          "markdown": "https://banes-lab.com/records/lexicon/extract-function.md",
          "ref": "lexicon:extract-function"
        },
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-extract-module",
          "json": "https://banes-lab.com/json/records/lexicon/extract-module",
          "label": "Extract Module",
          "markdown": "https://banes-lab.com/records/lexicon/extract-module.md",
          "ref": "lexicon:extract-module"
        },
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-introduce-parameter-object",
          "json": "https://banes-lab.com/json/records/lexicon/introduce-parameter-object",
          "label": "Introduce Parameter Object",
          "markdown": "https://banes-lab.com/records/lexicon/introduce-parameter-object.md",
          "ref": "lexicon:introduce-parameter-object"
        },
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-centralize-the-rule",
          "json": "https://banes-lab.com/json/records/lexicon/centralize-the-rule",
          "label": "Centralize the Rule",
          "markdown": "https://banes-lab.com/records/lexicon/centralize-the-rule.md",
          "ref": "lexicon:centralize-the-rule"
        }
      ],
      "relation": "refactored-by"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology/schema#vocabulary-severity-mandatory",
          "json": "https://banes-lab.com/json/records/vocabulary/severity-mandatory",
          "label": "mandatory",
          "markdown": "https://banes-lab.com/records/vocabulary/severity-mandatory.md",
          "ref": "vocabulary:severity-mandatory"
        }
      ],
      "relation": "severity"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology#architecture-category-core-modular-design",
          "json": "https://banes-lab.com/json/records/architecture-category/core-modular-design",
          "label": "Core Modular Design",
          "markdown": "https://banes-lab.com/records/architecture-category/core-modular-design.md",
          "ref": "architecture-category:core-modular-design"
        }
      ],
      "relation": "category"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/anatomy/governance#file-governance-rules-eslint-closure-no-platform-capability-redefine-eslint-rule-ts",
          "json": "https://banes-lab.com/json/source/governance/rules/eslint/closure-no-platform-capability-redefine.eslint.rule.ts",
          "label": "rules/eslint/closure-no-platform-capability-redefine.eslint.rule.ts",
          "markdown": "https://banes-lab.com/source/governance/rules/eslint/closure-no-platform-capability-redefine.eslint.rule.ts.md",
          "ref": "anatomy:file-governance-rules-eslint-closure-no-platform-capability-redefine-eslint-rule-ts"
        }
      ],
      "relation": "enforced-by"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/anatomy/governance#file-governance-rules-eslint-markup-through-builder-eslint-rule-ts",
          "json": "https://banes-lab.com/json/source/governance/rules/eslint/markup-through-builder.eslint.rule.ts",
          "label": "rules/eslint/markup-through-builder.eslint.rule.ts",
          "markdown": "https://banes-lab.com/source/governance/rules/eslint/markup-through-builder.eslint.rule.ts.md",
          "ref": "anatomy:file-governance-rules-eslint-markup-through-builder-eslint-rule-ts"
        }
      ],
      "relation": "detected-by"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology#architecture-metaprogramming",
          "json": "https://banes-lab.com/json/records/architecture/metaprogramming",
          "label": "Metaprogramming",
          "markdown": "https://banes-lab.com/records/architecture/metaprogramming.md",
          "ref": "architecture:metaprogramming"
        },
        {
          "href": "https://banes-lab.com/ontology#architecture-normalization",
          "json": "https://banes-lab.com/json/records/architecture/normalization",
          "label": "Normalization",
          "markdown": "https://banes-lab.com/records/architecture/normalization.md",
          "ref": "architecture:normalization"
        }
      ],
      "relation": "reinforced-by"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/disciplined-methodology/build#one-home",
          "json": "https://banes-lab.com/json/disciplined-methodology/build/one-home",
          "label": "One home",
          "markdown": "https://banes-lab.com/disciplined-methodology/build/one-home.md",
          "ref": "chapter:/disciplined-methodology/build#one-home"
        },
        {
          "href": "https://banes-lab.com/disciplined-methodology/verify#counting-copies",
          "json": "https://banes-lab.com/json/disciplined-methodology/verify/counting-copies",
          "label": "Counting copies",
          "markdown": "https://banes-lab.com/disciplined-methodology/verify/counting-copies.md",
          "ref": "chapter:/disciplined-methodology/verify#counting-copies"
        },
        {
          "href": "https://banes-lab.com/software-architecture/principles#the-structural-domain",
          "json": "https://banes-lab.com/json/software-architecture/principles/the-structural-domain",
          "label": "The structural domain",
          "markdown": "https://banes-lab.com/software-architecture/principles/the-structural-domain.md",
          "ref": "chapter:/software-architecture/principles#the-structural-domain"
        },
        {
          "href": "https://banes-lab.com/software-architecture/principles#separate-trade-or-mitigate",
          "json": "https://banes-lab.com/json/software-architecture/principles/separate-trade-or-mitigate",
          "label": "Separate, trade, or mitigate",
          "markdown": "https://banes-lab.com/software-architecture/principles/separate-trade-or-mitigate.md",
          "ref": "chapter:/software-architecture/principles#separate-trade-or-mitigate"
        },
        {
          "href": "https://banes-lab.com/software-architecture/glossary#the-principle-architecture",
          "json": "https://banes-lab.com/json/software-architecture/glossary/the-principle-architecture",
          "label": "The principle architecture",
          "markdown": "https://banes-lab.com/software-architecture/glossary/the-principle-architecture.md",
          "ref": "chapter:/software-architecture/glossary#the-principle-architecture"
        },
        {
          "href": "https://banes-lab.com/ontology#architecture-category-core-modular-design",
          "json": "https://banes-lab.com/json/ontology/principles/architecture-category-core-modular-design",
          "label": "Core Modular Design",
          "markdown": "https://banes-lab.com/ontology/principles/architecture-category-core-modular-design.md",
          "ref": "chapter:/ontology#architecture-category-core-modular-design"
        },
        {
          "href": "https://banes-lab.com/ontology#architecture-category-metaprogramming-language-oriented-architecture",
          "json": "https://banes-lab.com/json/ontology/principles/architecture-category-metaprogramming-language-oriented-architecture",
          "label": "Metaprogramming / Language-Oriented Architecture",
          "markdown": "https://banes-lab.com/ontology/principles/architecture-category-metaprogramming-language-oriented-architecture.md",
          "ref": "chapter:/ontology#architecture-category-metaprogramming-language-oriented-architecture"
        },
        {
          "href": "https://banes-lab.com/ontology#architecture-category-schema-canonical-data-semantics",
          "json": "https://banes-lab.com/json/ontology/principles/architecture-category-schema-canonical-data-semantics",
          "label": "Schema / Canonical Data / Semantics",
          "markdown": "https://banes-lab.com/ontology/principles/architecture-category-schema-canonical-data-semantics.md",
          "ref": "chapter:/ontology#architecture-category-schema-canonical-data-semantics"
        },
        {
          "href": "https://banes-lab.com/ontology#architecture-category-transactions-state-concurrency",
          "json": "https://banes-lab.com/json/ontology/principles/architecture-category-transactions-state-concurrency",
          "label": "Transactions / State / Concurrency",
          "markdown": "https://banes-lab.com/ontology/principles/architecture-category-transactions-state-concurrency.md",
          "ref": "chapter:/ontology#architecture-category-transactions-state-concurrency"
        },
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-category-core-modular-design",
          "json": "https://banes-lab.com/json/ontology/lexicon/lexicon-category-core-modular-design",
          "label": "Core Modular Design",
          "markdown": "https://banes-lab.com/ontology/lexicon/lexicon-category-core-modular-design.md",
          "ref": "chapter:/ontology/lexicon#lexicon-category-core-modular-design"
        },
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-category-quality-attributes",
          "json": "https://banes-lab.com/json/ontology/lexicon/lexicon-category-quality-attributes",
          "label": "Quality Attributes",
          "markdown": "https://banes-lab.com/ontology/lexicon/lexicon-category-quality-attributes.md",
          "ref": "chapter:/ontology/lexicon#lexicon-category-quality-attributes"
        },
        {
          "href": "https://banes-lab.com/ontology/schema#the-vocabulary-severity",
          "json": "https://banes-lab.com/json/ontology/schema/the-vocabulary-severity",
          "label": "Severity levels",
          "markdown": "https://banes-lab.com/ontology/schema/the-vocabulary-severity.md",
          "ref": "chapter:/ontology/schema#the-vocabulary-severity"
        },
        {
          "href": "https://banes-lab.com/ontology/schema#the-resolutions",
          "json": "https://banes-lab.com/json/ontology/schema/the-resolutions",
          "label": "The resolutions",
          "markdown": "https://banes-lab.com/ontology/schema/the-resolutions.md",
          "ref": "chapter:/ontology/schema#the-resolutions"
        }
      ],
      "relation": "linked-from"
    }
  ],
  "summary": "A design rule that each piece of logic, constant or schema has one source in the code, and every other use refers to it.",
  "siblings": {
    "next": {
      "href": "https://banes-lab.com/ontology#architecture-high-cohesion",
      "json": "https://banes-lab.com/json/records/architecture/high-cohesion",
      "label": "High Cohesion",
      "markdown": "https://banes-lab.com/records/architecture/high-cohesion.md",
      "ref": "architecture:high-cohesion"
    },
    "previous": {
      "href": "https://banes-lab.com/ontology#architecture-separation-of-concerns",
      "json": "https://banes-lab.com/json/records/architecture/separation-of-concerns",
      "label": "Separation of Concerns",
      "markdown": "https://banes-lab.com/records/architecture/separation-of-concerns.md",
      "ref": "architecture:separation-of-concerns"
    }
  },
  "up": {
    "href": null,
    "json": "https://banes-lab.com/json/api/records/architecture",
    "label": "Architecture principles",
    "markdown": "https://banes-lab.com/api/records/architecture.md",
    "ref": "api:records/architecture"
  },
  "aliases": [
    "DRY",
    "Do Not Repeat Yourself",
    "Don't Repeat Yourself"
  ],
  "exemplar": {
    "after": "function validateName(name: string) {\n  if (!name || name.length > 40) throw new Error(\"invalid name\");\n}\nfunction validateFoo(foo: Foo) { validateName(foo.name); }\nfunction validateBar(bar: Bar) { validateName(bar.name); }",
    "before": "function validateFoo(foo: Foo) {\n  if (!foo.name || foo.name.length > 40) throw new Error(\"invalid name\");\n}\nfunction validateBar(bar: Bar) {\n  if (!bar.name || bar.name.length > 40) throw new Error(\"invalid name\");\n}",
    "lang": "ts",
    "medium": "code"
  },
  "formedBy": null,
  "scope": [
    "function",
    "module",
    "domain"
  ],
  "severity": "mandatory"
}
