{"record":{"id":"3f211d86880e2d07","repo":"inancgumus/learngo","slug":"please-provide-a-valid-number-err","errorCode":null,"errorMessage":"Please provide a valid number: <err>","messagePattern":"Please provide a valid number: <err>","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"x-tba/foundations/calc/09-packages/calc/calc.go","lineNumber":21,"sourceCode":"// Parse ...\nfunc Parse(snum string) (n float64, err error) {\n\tn, err = strconv.ParseFloat(snum, 64)\n\tif err != nil {\n\t\t// Don't loose the actual error for debugging\n\t\terr = errors.New(\"Please provide a valid number: \" +\n\t\t\terr.Error())\n\t}\n\treturn\n}","sourceCodeStart":3,"sourceCodeEnd":39,"githubUrl":"https://github.com/inancgumus/learngo/blob/3c475a78e54336c6255e925ff66b8ef4da6a2ae7/x-tba/foundations/calc/09-packages/calc/calc.go#L3-L39","documentation":"Parse() wraps strconv.ParseFloat's error when the input string (snum) is not a valid 64-bit floating-point number. The original parse error is deliberately concatenated so the underlying cause is not lost for debugging; the caller (main) gets a user-friendly prompt instead of a raw strconv message.","triggerScenarios":"Thrown at x-tba/foundations/calc/09-packages/calc/calc.go:21 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Print the returned error and prompt the user to re-enter the number.","Before calling calc.Parse, trim whitespace and verify the token contains only digits, sign, and decimal point.","Accept the error as terminal input validation feedback; there is no recovery beyond asking again."],"exampleFix":null,"handlingStrategy":"validation","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"3c475a78e54336c6255e925ff66b8ef4da6a2ae7","analyzedAt":"2026-09-02T10:14:38.492Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-09T16:17:10.729Z"}