September 2017 Update

Task/Conditional-structures/Jq/conditional-structures-1.jq

@@ -0,0 +1 @@
+if cond then f else g end

Task/Conditional-structures/Jq/conditional-structures-2.jq

@@ -0,0 +1 @@
+if cond then f elif cond1 then f1 .... else g end

Task/Conditional-structures/Jq/conditional-structures-3.jq

@@ -0,0 +1,4 @@
+if empty then 2 else 3 end          # produces no value
+if 1 then 2 else 3 end              # produces 2
+if [false, false] then 2 else 3 end # produces 2
+if (true, true) then 2 else 3 end   # produces a stream: 2, 2

Task/Conditional-structures/Jq/conditional-structures-4.jq

@@ -0,0 +1,7 @@
+exp
+ | if   . == true then "true"
+   elif . == false then "false"
+   elif . == null  then "maybe"
+   elif type == "string" then .
+   else error("unexpected value: \(.)")
+   end