A filter of the form a // b produces the same results as a, if a produces results other than false and null. Otherwise, a // b produces the same results as b.
This is useful for providing defaults: .foo or 1 will evaluate to 1 if there’s no .foo element in the input. It’s similar to how or is sometimes used in Python (jq’s or operator is reserved for strictly Boolean operations).
This is useful for providing defaults: .foo // 1 will evaluate to 1 if there’s no .foo element in the input. It’s similar to how or is sometimes used in Python (jq’s or operator is reserved for strictly Boolean operations).