Parse Quoted CSV Fields
Keep commas inside paired quotation marks as part of one field.
About 22 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
CSV quoting can keep a separator inside one field. In our stated dialect comma separates fields and a double-quoted phrase can include a comma. Splitting every comma blindly breaks that row. A parser should use the documented dialect; the paper exercise supplies its rules.
Keep commas inside paired quotation marks as part of one field. A comma inside a quoted field is not a new column boundary.
Use this supplied case: Request first field. CSV row: A,"red,blue",5. Which parsed field is requested? 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.
- Keep commas inside paired quotation marks as part of one field.
- 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
Request first field. CSV row: A,"red,blue",5. Which parsed field is requested? The supported answer is A. Keep commas inside paired quotation marks as part of one field. A comma inside a quoted field is not a new column boundary. CSV quoting can keep a separator inside one field. 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
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Helpful tips
- Keep commas inside paired quotation marks as part of one field.
- A comma inside a quoted field is not a new column boundary.
See the answer and explanation
red,blue
The supplied case states: Request second field. CSV row: A,"red,blue",5. Which parsed field is requested? Under the stated distinction, this identifies red,blue. CSV quoting can keep a separator inside one field. In our stated dialect comma separates fields and a double-quoted phrase can include a comma. Splitting every comma blindly breaks that row. A parser should use the documented dialect; the paper exercise supplies its rules. Keep commas inside paired quotation marks as part of one field.
Take it further
New CSV:Q,"north,east",8 under comma/double-quote rules gives three fields:Q,"north,east",8. The embedded comma stays in the second field.
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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.
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Check the subject sources
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