where
Use the where function to apply a specified application function (app) to a field (field) to evaluate the field value (value).
The function returns a boolean value based on the result of the application.
This function is most often used in conjunction with filter and select operations.
Basic syntax
To apply an application function to a field in a value, use the following syntax:
(where field app)
Arguments
Use the following arguments to specify the field, application function, and value for evaluation using the where Pact function.
| Argument | Type | Description |
|---|---|---|
field | string | Specifies the field in the value to be evaluated. |
app | function | Specifies the application function to be applied to the field. |
value | object:<{row}> | Specifies the value containing the field to be evaluated. |
Return value
The where function returns a boolean value based on the result of applying the specified application function to the field in the value.
Examples
The following example demonstrates how to use the where function in the Pact REPL.
This example applies a condition for filtering a list of objects where the "age" field value is less than 20:
(filter (where 'age (> 20)) [{'name: "Mary",'age: 30} {'name: "Juan",'age: 15}])
[{"age":15, "name":"Juan"}]