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sprintf vs String.Format

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open FSharpx.TimeMeasurement //in nuget package FSharpx.Extras

compareTwoRuntimes 
    10
    "sprintf"
    (fun _ -> for _ in 1..100000 do sprintf "%d" 1024 |> ignore)
    "String.Format"
    (fun _ -> for _ in 1..100000 do System.String.Format ("{0}", 1024) |> ignore)

compareTwoRuntimes 
    10
    "sprintf"
    (fun _ -> 
        for _ in 1..100000 do
            sprintf "%d %s %O" 1024 "a string" (obj()) |> ignore)
    "String.Format"
    (fun _ ->
        for _ in 1..100000 do
            System.String.Format ("{0} {1} {2}", 1024, "a string", obj()) |> ignore)

compareTwoRuntimes 
    10
    "sprintf"
    (fun _ -> 
        for _ in 1..100000 do
            sprintf "%d %s %O %d %s %O" 1024 "a string" (obj()) 1024 "a string" (obj()) |> ignore)
    "String.Format"
    (fun _ ->
        for _ in 1..100000 do
            System.String.Format ("{0} {1} {2} {3} {4} {5}", 1024, "a string", obj(), 1024, "a string", obj()) |> ignore)

(*
sprintf 45.0ms
String.Format 25.6ms
  Ratio:  1.7578125

sprintf 165.9ms
String.Format 40.7ms
  Ratio:  4.076167076

sprintf 299.1ms
String.Format 73.7ms
  Ratio:  4.05834464
*)

namespace FSharpx

module TimeMeasurement

from FSharpx

val compareTwoRuntimes : count:int -> desc1:string -> f1:(unit -> 'a) -> desc2:string -> f2:(unit -> 'b) -> unit

Full name: FSharpx.TimeMeasurement.compareTwoRuntimes

val sprintf : format:Printf.StringFormat<'T> -> 'T

Full name: Microsoft.FSharp.Core.ExtraTopLevelOperators.sprintf

val ignore : value:'T -> unit

Full name: Microsoft.FSharp.Core.Operators.ignore

namespace System

Multiple items
type String =
  new : value:char -> string + 7 overloads
  member Chars : int -> char
  member Clone : unit -> obj
  member CompareTo : value:obj -> int + 1 overload
  member Contains : value:string -> bool
  member CopyTo : sourceIndex:int * destination:char[] * destinationIndex:int * count:int -> unit
  member EndsWith : value:string -> bool + 2 overloads
  member Equals : obj:obj -> bool + 2 overloads
  member GetEnumerator : unit -> CharEnumerator
  member GetHashCode : unit -> int
  ...

Full name: System.String

--------------------
System.String(value: nativeptr<char>) : unit
System.String(value: nativeptr<sbyte>) : unit
System.String(value: char []) : unit
System.String(c: char, count: int) : unit
System.String(value: nativeptr<char>, startIndex: int, length: int) : unit
System.String(value: nativeptr<sbyte>, startIndex: int, length: int) : unit
System.String(value: char [], startIndex: int, length: int) : unit
System.String(value: nativeptr<sbyte>, startIndex: int, length: int, enc: System.Text.Encoding) : unit

System.String.Format(format: string, [<System.ParamArray>] args: obj []) : string
System.String.Format(format: string, arg0: obj) : string
System.String.Format(provider: System.IFormatProvider, format: string, [<System.ParamArray>] args: obj []) : string
System.String.Format(format: string, arg0: obj, arg1: obj) : string
System.String.Format(format: string, arg0: obj, arg1: obj, arg2: obj) : string

type obj = System.Object

Full name: Microsoft.FSharp.Core.obj

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Link:	http://fssnip.net/mQ
Posted:	8 years ago
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