F#
स्ट्रिंग्स

स्ट्रिंग शाब्दिक

let string1 = "Hello" //simple string

let string2 = "Line\nNewLine" //string with newline escape sequence

let string3 = @"Line\nSameLine" //use @ to create a verbatim string literal

let string4 = @"Line""with""quoutes inside" //double quoute to indicate a single quoute inside @ string

let string5 = """single "quote" is ok""" //triple-quote string literal, all symbol including quote are verbatim

let string6 = "ab
cd"// same as "ab\ncd"

let string7 = "xx\
    yy" //same as "xxyy", backslash at the end contunies the string without new line, leading whitespace on the next line is ignored 

सरल स्ट्रिंग स्वरूपण

परिणामस्वरूप स्वरूपित करने और स्ट्रिंग प्राप्त करने के कई तरीके हैं।

.NET तरीका String.Format या StringBuilder.AppendFormat का String.Format करके है:

open System
open System.Text

let hello = String.Format ("Hello {0}", "World")
// return a string with "Hello World"

let builder = StringBuilder()
let helloAgain = builder.AppendFormat ("Hello {0} again!", "World")
// return a StringBuilder with "Hello World again!"

F # में C- शैली में स्ट्रिंग को प्रारूपित करने के लिए फ़ंक्शन भी हैं। प्रत्येक .NET फ़ंक्शन के लिए समतुल्य हैं:

• sprintf (स्ट्रींग.फॉर्म):

open System

let hello = sprintf "Hello %s" "World" 
// "Hello World", "%s" is for string

let helloInt = sprintf "Hello %i" 42 
// "Hello 42", "%i" is for int

let helloFloat = sprintf "Hello %f" 4.2 
// "Hello 4.2000", "%f" is for float

let helloBool = sprintf "Hello %b" true 
// "Hello true", "%b" is for bool

let helloNativeType = sprintf "Hello %A again!" ("World", DateTime.Now) 
// "Hello {formatted date}", "%A" is for native type

let helloObject = sprintf "Hello %O again!" DateTime.Now 
// "Hello {formatted date}", "%O" is for calling ToString

• bprintf (StringBuilder.AppendFormat):

open System
open System.Text

let builder = StringBuilder()

// Attach the StringBuilder to the format function with partial application
let append format = Printf.bprintf builder format

// Same behavior as sprintf but strings are appended to a StringBuilder
append "Hello %s again!\n" "World"
append "Hello %i again!\n" 42
append "Hello %f again!\n" 4.2
append "Hello %b again!\n" true
append "Hello %A again!\n" ("World", DateTime.Now)
append "Hello %O again!\n" DateTime.Now

builder.ToString() // Get the result string

.NET फ़ंक्शन के बजाय उन फ़ंक्शन का उपयोग करना कुछ लाभ प्रदान करता है:

• प्रकार की सुरक्षा
• आंशिक आवेदन
• एफ # देशी प्रकार का समर्थन