Define a Validation Rule before Cleaning
Apply every stated requirement and report the first relevant violation.
About 18 minutes, plus any extended practice
Supplied materials
- Paper and pencil; answers may also be spoken or typed.
- All cases, labels, numbers and rules are supplied on this page. No real account, private information or purchase is needed.
Learn the idea
Validation checks whether values satisfy a stated contract. The same value can be acceptable in one field and invalid in another. A rule must specify required fields, allowed values and ranges before the learner decides how to handle records. Unknown values should not be silently replaced with invented ones.
Apply every stated requirement and report the first relevant violation. A plausible value can still violate the defined range or type.
Use this supplied case: idA,count 3,red. Contract: id nonempty; count whole number 0–9; category red/blue. Classify record. The task is to connect the given information to the computing idea. Write a short evidence trail so another learner can reproduce your choice. The simplified case describes the stated model, not every real system.
- Represent the supplied worked case with a labeled drawing, table or short trace.
- Apply every stated requirement and report the first relevant violation.
- Explain why the worked answer fits and why one alternative does not.
- Try the new check and practice cases; revisit the stated rule if your evidence does not match.
See the method in action
idA, count 3, red. Contract: id nonempty; count whole number 0–9; category red/blue. Classify record. The supported answer is Valid. Apply every stated requirement and report the first relevant violation. A plausible value can still violate the defined range or type. Validation checks whether values satisfy a stated contract. The supplied facts, rather than an assumed real-world detail, determine this paper case. Compare the recorded action or value with the stated rule before choosing an answer.
Check your reasoning
Your answer is temporary and is not saved to an account. Download your current answer before leaving or reloading. Written work on paper or in another app stays in your own file.
Helpful tips
- Apply every stated requirement and report the first relevant violation.
- A plausible value can still violate the defined range or type.
See the answer and explanation
Missing ID
The supplied case states: empty id,count 2,blue. Contract: id nonempty; count whole number 0–9; category red/blue. Classify record. Under the stated distinction, this identifies Missing ID. Validation checks whether values satisfy a stated contract. The same value can be acceptable in one field and invalid in another. A rule must specify required fields, allowed values and ranges before the learner decides how to handle records. Unknown values should not be silently replaced with invented ones. Apply every stated requirement and report the first relevant violation.
Take it further
Contract: count is an integer 0–5. Inputs 5, 6 and 2.5 yield accepted, out-of-range, and wrong numeric type. Do not clip 6 to 5 without a changed contract.
Nothing here is saved to an account or sent to a teacher. The answer download includes your current choice and any checked feedback. It does not include choices from the separate More practice section. Download that section separately.
More practice: try new cases
Choose an answer for each problem. Explain your method on paper, then use the feedback to decide what to revisit.
Your choices are temporary. Feedback appears after you check all the answers.
Nothing here is saved to an account or sent to a teacher. Keep your own notes or download them before leaving. The score describes these questions; it does not certify subject mastery.
Check the subject sources
These LifeStarter passages, scenarios and exercises are authored for this Academy with AI assistance and review. External resources keep their publishers’ terms. A grade label suggests a starting level; it does not establish alignment with your school’s complete requirements.