Higher Order Operators
Higher order operations are significantly more complex than the other types of operations, because they allow you to apply a piece of logic iteratively.
| Operators | Instruction |
|---|---|
| Map | map |
| Reduce | reduce |
| Filter | Filter |
| Every | every, all |
| Some | some |
| None | none |
| Each Object Key | eachKey |
Additionally, it is important to note that this module supports handlebars style traversal of data within these control structures.
Map
The first operand defines the array you are operating on, while the second defines the operation you are performing. The context switches such that the local variable is the value from the array.
This following example shows the Handlebars style traversal -
Reduce
The first operand defines the array you are operating on, while the second defines the operation you are performing. The context switches such that the value "current" is the value from the array, and "accumulator" is the accumulated value.
The third operand can be excluded.
Filter
Every, All
Some
None
Each Key
Sometimes you may wish to iterate over an object instead of an array, executing the logic on each value in the object.
json-logic-engine has a built in operator for this: