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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Uniqueness in arrays with simple datatype","articleBody":"Thank you very much for the nestedObjectAssign function. It helps me to update data into aws dynamodb. \r\n\r\ndescribe(\"array object\", () =\u003e {\r\n\r\n    it(\"should add text to empty comments array\", () =\u003e {\r\n      const dbData = {comments: []}\r\n      const requestData = {comments: [\"foo\"]}\r\n\r\n      nestedObjectAssign(dbData, requestData);\r\n      expect(dbData).toStrictEqual({comments: [\"foo\"]});\r\n    });\r\n\r\n    it(\"should NOT add text duplicates\", () =\u003e {\r\n      const dbData = {comments: [\"foo\"]}\r\n      const requestData = {comments: [\"foo\"]}\r\n\r\n      nestedObjectAssign(dbData, requestData);\r\n      expect(dbData).toStrictEqual({comments: [\"foo\"]});\r\n    });\r\n\r\n    it(\"should NOT change existing properties in db, if they not updated via request\", () =\u003e {\r\n      const dbData = {comments: [\"bar\", \"foo\"]}\r\n      const requestData = {comments: [\"foo\"]}\r\n\r\n      nestedObjectAssign(dbData, requestData);\r\n      expect(dbData).toStrictEqual({comments: [\"bar\", \"foo\"]});\r\n    });\r\n  });\r\n\r\nTo realize green tests i changed the function to typescript and \r\nchanged line 23 to `target[key] = [...new Set([...target[key], ...source[key]])]`\r\n\r\nHopefully it helps someone. \r\n\r\n\r\n\r\n\r\n\r\n","author":{"url":"https://github.com/SpinGit","@type":"Person","name":"SpinGit"},"datePublished":"2021-11-08T13:31:30.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/14/NestedObjectAssign/issues/14"}