Which code snippet accomplishes writing a query filter for all ABC_book items whose title contains "Guide"?

Which code snippet accomplishes writing a query filter for all ABC_book items whose title contains "Guide"?

• A. a!queryFilter( field: "title", operator: "includes". value: "guide" )
• B. a!queryFilter(field: "title", operator: "equals", value: "Guide")
• C. a!queryFilter(field: "title", operator: "startsWith", value: "Guide")
• D. a!queryFilter(field: "title", operator: "includes", value: "Guide")

Answer: (A)

To find all ABC_book items where the title contains a given substring, use a query filter with the includes operator on the title field. The includes operator checks whether the field’s value contains the specified substring anywhere inside it, not just at the start or as an exact match. So setting the field to the title and the operator to includes with the value "Guide" will return any title that has "Guide" somewhere in it (case typically isn’t sensitive, so "Guide" matches "guide" as well). This is why the snippet using field: "title", operator: "includes", value: "Guide" is the right choice. Using equals would require an exact title match, and using startsWith would only match titles that begin with "Guide," which isn’t what you want for a broader contains check.

To find all ABC_book items where the title contains a given substring, use a query filter with the includes operator on the title field. The includes operator checks whether the field’s value contains the specified substring anywhere inside it, not just at the start or as an exact match. So setting the field to the title and the operator to includes with the value "Guide" will return any title that has "Guide" somewhere in it (case typically isn’t sensitive, so "Guide" matches "guide" as well). This is why the snippet using field: "title", operator: "includes", value: "Guide" is the right choice. Using equals would require an exact title match, and using startsWith would only match titles that begin with "Guide," which isn’t what you want for a broader contains check.