FN

FN denotes an anonymous function. Similar to WITH, FN is a closure and allows variables to be defined within the argument context and then referenced later. It takes an indeterminate number of arguments.

Function category: Special​

Syntax

FN([var1, ..., varN,] expr)

Examples

Let's say we're given a response with the following vehicle performance information.

{
  "data": {
    "vehicle_safety_ratings": [92, 84, 71, 80, 96],
    "vehicle_performance_ratings": [95, 81, 77, 83, 90]
  }
}

Example 1: Find relative vehicle scores

If we wanted relative vehicle scores with the highest existing score serving as a benchmark, use the following function.

# Pass the function FN in the function argument to MAP
MAP(
    FN(x, x + 4), 
    data.vehicle_safety_ratings
)
​
# Returns [96, 88, 75, 84, 100]

Example 2: Using multiple arguments

We can also use multiple arguments, as in the following function. If we wanted to generate a combined_vehicle_rating, use the following function. FN with MAP can take two arguments and generate a combined_vehicle_rating:

# Pass the function FN in the function argument to MAP
# using multiple arguments
MAP(
    FN(x, y, x + y), 
    data.vehicle_safety_ratings, 
    data.vehicle_performance_ratings
)
​
# Returns [187, 165 ,148, 163, 186]