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Errors and Robustness: JavaScript: Uncharted

Courses JavaScriptErrors and Robustness

Errors and Robustness

Read failures as evidence, design clear error contracts, guard boundaries, and debug with a repeatable method.

JavaScript
Unit 15 of 20
20 lessons
178 min
420 XP

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Lessons

20 total

1Errors Are InformationDecode the message, location, and call trail in a JavaScript error report.InteractiveConcept6 min20 XPOpen
2Follow the TrailUse a stack trace to locate and repair the call where a TypeError begins.CodeConcept8 min20 XPOpen
3Error Field GuideRepair a SyntaxError, ReferenceError, and TypeError revealed in sequence.CodeConcept11 min20 XPOpen
4Throw Your OwnThrow an Error when a quantity violates a function contract.CodeConcept8 min20 XPOpen
5try and catchCatch a parsing failure, report a fallback, and let the program continue.CodeConcept8 min20 XPOpen
6finally, AlwaysUse finally to record cleanup after both success and failure.CodeConcept8 min20 XPOpen
7Messages That HelpReplace vague thrown errors with actionable messages that include useful context.CodeConcept9 min20 XPOpen
8Which Line Throws?Predict the exact line where a nested property access throws.InteractiveConcept7 min20 XPOpen
9Guard the GatesValidate a guest name before mutating a roster.CodeConcept10 min20 XPOpen
10Parse Without FearWrap JSON.parse in try and catch and return a fresh fallback save.CodeConcept9 min20 XPOpen
11Throw or Return null?Choose an error contract based on whether absence is expected or invalid.InteractiveConcept7 min20 XPOpen
12Debugging Is a MethodArrange a repeatable debugging process from reproduction through verification.InteractiveConcept7 min20 XPOpen
13Logs with LabelsUse labeled logs to expose and repair a planted cart calculation bug.CodeConcept10 min20 XPOpen
14Bug Hunt OneRepair three independent logic bugs using tests as the source of truth.CodePractice11 min20 XPOpen
15Unbreakable Tip CalculatorValidate calculator inputs and throw helpful typed errors for garbage data.CodePractice11 min20 XPOpen
16Nested Catch PredictionsPredict control flow when an inner catch handles an error.InteractiveConcept7 min20 XPOpen
17Defensive Array UtilsReturn sensible fallbacks from safeFirst and safeAt for unusable requests.CodePractice10 min20 XPOpen
18Fail Loud, Fail EarlyExplain why an early actionable failure is safer than a quiet wrong result.InteractiveConcept9 min20 XPOpen
19Bug Hunt TwoUse a truth table to repair a plausible shipping eligibility bug.CodePractice10 min20 XPOpen
20Errors Mastery CheckParse, validate, report, and recover from booking failures with explicit contracts.CodeMastery check12 min40 XPOpen

Objects with Behavior Asynchronous JavaScript