type
  Person = object
    age: int
    name: string
  
import std/algorithm

var ps = @[Person(age: 10, name: "John"), Person(age: 42, name: "Tom")]

echo ps.binarySearch("Tom", proc (x: Person, y: string): int =
  system.cmp(x.name, y)
)

proc binarySearch(x: openArray[Person], y: string): int =
  ps.binarySearch("Tom", proc (x: Person, y: string): int =
    system.cmp(x.name, y)
  )
  
echo ps.binarySearch("Tom")