Preserve an Original before a Transformation
Compare the source before/after record and distinguish a new result from a mutation.
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
Some operations mutate a collection while others produce a new one. A transformation plan should state whether the original must remain available. Our model describes the result and source explicitly. Keeping an original enables comparison and recovery, but additional copies also need appropriate privacy handling.
Compare the source before/after record and distinguish a new result from a mutation. Assigning another name to the same mutable object is not automatically an independent copy.
Use this supplied case: Trans form returns a new ordered list; source unchanged. Classify the stated result. 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.
- Compare the source before/after record and distinguish a new result from a mutation.
- 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
Trans form returns a new ordered list; source unchanged. Classify the stated result. The supported answer is New result, original retained. Compare the source before/after record and distinguish a new result from a mutation. Assigning another name to the same mutable object is not automatically an independent copy. 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
- Compare the source before/after record and distinguish a new result from a mutation.
- Assigning another name to the same mutable object is not automatically an independent copy.
See the answer and explanation
Original mutated
The supplied case states: In-place operation changes source values. Classify the stated result. Under the stated distinction, this identifies Original mutated. Some operations mutate a collection while others produce a new one. A transformation plan should state whether the original must remain available. Our model describes the result and source explicitly. Keeping an original enables comparison and recovery, but additional copies also need appropriate privacy handling. Compare the source before/after record and distinguish a new result from a mutation.
Take it further
An alias refers to the same list[1, 3]. Appending 5 through either name changes that one list. An independent copy requires a copying operation defined for the data.
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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.
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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.