jq lessons

jq filters

map

• map(f) applies filter f to each element and collects results
• e.g. run an operation on every element of the array and output an array with the results

foreach

• foreach is like reduce but outputs at each step
  • foreach EXPR as $var (INIT; UPDATE; EXTRACT)

paths()

• paths() all paths as arrays
• leafpath paths to all leaf values
  • {"name":"Alice","age":30,"address":{"city":"Berlin","zip":"10115"}}
    • paths(scalars) | join(".") or leaf_paths | join(".")
      • result:

"name"
"age"
"address.city"
"address.zip"

lessons/exercises

sample data

https://services.odata.org/v4/northwind/northwind.svc/Customer_and_Suppliers_by_Cities
https://feed-prod.unitycms.io/2/newest?count=50