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      On this page
        • contains(String, String): Boolean
        • drop(String, Int): String
        • dropRight(String, Int): String
        • indexOf(String, String): Int|Unit
        • indexOf(String, String, Int): Int|Unit
        • lastIndexOf(String, String): Int|Unit
        • lastIndexOf(String, String, Int): Int|Unit
        • makeString(List[String], String): String
        • size(String): Int
        • split(String, String): List[String]
        • take(String, Int): String
        • takeRight(String, Int): String
      waves_logo Docs

          # [Ride v4 and v3] String functions

          ⚠️ This is the documentation for the Standard library version 4 and 3. We recommend to use version 6. Go to version 6

          ⚠️ Fixed an error in the implementation of string functions related to incorrect determination of UTF-8 character boundaries when splitting strings and searching for substrings in case of the strings contain special characters. The error could lead to invalid strings containing sequences that do not match any UTF-8 character. The fix is applied after activation of feature #16 “Ride V5, dApp-to-dApp invocations” regardless of the Standard library version.

          Name Description Complexity
          contains(String, String): Boolean Checks whether the string contains substring 3
          drop(String, Int): String Drops the first n characters of a string 1 for Standard Library version 3
          20 for Standard Library version 4
          dropRight(String, Int): String Drops the last n characters of a string 19 for Standard Library version 3
          20 for Standard Library version 4
          indexOf(String, String): Int|Unit Returns the index of the first occurrence of a substring 20 for Standard Library version 3
          3 for Standard Library version 4
          indexOf(String, String, Int): Int|Unit Returns the index of the first occurrence of a substring after a certain index 20 for Standard Library version 3
          3 for Standard Library version 4
          lastIndexOf(String, String): Int|Unit Returns the index of the last occurrence of a substring 20 for Standard Library version 3
          3 for Standard Library version 4
          lastindexOf(String, String, Int): Int|Unit Returns the index of the last occurrence of a substring before a certain index 20 for Standard Library version 3
          3 for Standard Library version 4
          makeString(List[String], String): String Concatenates list strings adding a separator 30
          size(String): Int Returns the size of a string 1
          split(String, String): List[String] Splits a string delimited by a separator into a list of substrings 100 for Standard Library version 3
          75 for Standard Library version 4
          take(String, Int): String Takes the first n characters from a string 1 for Standard Library version 3
          20 for Standard Library version 4
          takeRight(String, Int): String Takes the last n characters from a string 19 for Standard Library version 3
          20 for Standard Library version 4

          # contains(String, String): Boolean

          Checks whether the string contains substring.

          ⚠️ The contains function is added in Standard library version 4.

          contains(haystack: String, needle: String): Boolean
          

          # Parameters

          Parameter Description
          haystack: String String to search in
          needle: String String to search for

          # Examples

          {-# STDLIB_VERSION 4 #-}
          {-# CONTENT_TYPE DAPP #-}
          {-# SCRIPT_TYPE ACCOUNT #-}
            
          "hello".contains("hell") # Returns true
          "hello".contains("world") # Returns false
          

          # drop(String, Int): String

          Drops the first n characters of a string.

          drop(xs: String, number: Int): String
          

          # Parameters

          Parameter Description
          xs: String The string
          number: Int The number n

          # Examples

          drop("Apple", 0) # Returns "Apple"
          drop("Apple", 1) # Returns "pple"
          drop("Apple", 3) # Returns "le"
          drop("Apple", 5) # Returns an empty string
          drop("Apple", 15) # Returns an empty string
          

          # dropRight(String, Int): String

          Drops the last n characters of a string.

          dropRight(xs: String, number: Int): String
          

          # Parameters

          Parameter Description
          xs: String The string
          number: Int The number n

          # Examples

          dropRight("Apple", 0) # Returns "Apple"
          dropRight("Apple", 1) # Returns "Appl"
          dropRight("Apple", 3) # Returns "Ap"
          dropRight("Apple", 5) # Returns an empty string
          dropRight("Apple", 15) # Returns an empty string
          

          # indexOf(String, String): Int|Unit

          Returns the index of the first occurrence of a substring.

          indexOf(str: String, substr: String): Int|Unit
          

          # Parameters

          Parameter Description
          str: String The string
          substr: String The substring

          # Examples

          indexOf("Apple","ple") # Returns 2
          indexOf("Apple","le")  # Returns 3
          indexOf("Apple","e")   # Returns 4
          
          

          # indexOf(String, String, Int): Int|Unit

          Returns the index of the first occurrence of a substring after a certain index.

          indexOf(str: String, substr: String, offset: Int): Int|Unit
          

          # Parameters

          Parameter Description
          str: String The string
          substr: String The substring
          offset: Int The index

          # Examples

          indexOf("Apple","ple", 1)   # Returns 2
          indexOf("Apple","le", 2)    # Returns 3
          indexOf("Apple","e", 3)     # Returns 4
          indexOf("Apple","p", 0)     # Returns 1
          indexOf("Apple","p", 2)     # Returns 2
          indexOf("Apple","p", 3)     # Returns unit
          

          # lastIndexOf(String, String): Int|Unit

          Returns the index of the last occurrence of a substring.

          lastIndexOf(str: String, substr: String): Int|Unit
          

          # Parameters

          Parameter Description
          str: String The string
          substr: String The substring

          # Examples

          lastIndexOf("Apple","pp") # Returns 1
          lastIndexOf("Apple","p") # Returns 2
          lastIndexOf("Apple","s") # Returns unit
          

          # lastIndexOf(String, String, Int): Int|Unit

          Returns the index of the last occurrence of a substring before a certain index.

          lastIndexOf(str: String, substr: String, offset: Int): Int|Unit
          

          # Parameters

          Parameter Description
          str: String The string
          substr: String The substring
          offset: Int The index

          # Examples

          lastIndexOf("mamamama","ma",4) # Returns 4
          lastIndexOf("mamamama","ma",3) # Returns 2
          

          # makeString(List[String], String): String

          Concatenates list strings adding a separator.

          ⚠️ The makeString function is added in Standard library version 4.

          makeString(arr: List[String], separator: String): String
          

          # Parameters

          Parameter Description
          arr: List[String] List of strings to concatenate
          separator: String Separator

          # Example

          makeString(["Apple","Orange","Mango"], " & ") # Returns "Apple & Orange & Mango"
          

          # size(String): Int

          Returns the size of a string.

          size(xs: String): Int
          

          # Parameters

          Parameter Description
          xs: String The string

          # Examples

          size("Ap") # Returns 2
          size("Appl") # Returns 4
          size("Apple") # Returns 5
          

          # split(String, String): List[String]

          Splits a string delimited by a separator into a list of substrings.

          split(str: String, separator: String): List[String]
          

          # Parameters

          Parameter Description
          str: String The string
          separator: Int The separator

          # Examples

          split("A.p.p.l.e", ".") # Returns ["A", "p", "p", "l", "e"]
          split("Apple", ".") # Returns ["Apple"]
          split("Apple", "") # Returns ["A", "p", "p", "l", "e"]
          split("Ap.ple", ".") # Returns ["Ap","ple"]
          

          # take(String, Int): String

          Takes the first n characters from a string.

          take(xs: String, number: Int): String
          

          # Parameters

          Parameter Description
          xs: String The string
          number: Int The number n

          # Examples

          take("Apple", 0) # Returns an empty string
          take("Apple", 1) # Returns "A"
          take("Apple", 3) # Returns "App"
          take("Apple", 5) # Returns "Apple"
          take("Apple", 15) # Returns "Apple"
          take("Apple", -10) # Returns an empty string
          

          # takeRight(String, Int): String

          Takes the last n characters from a string.

          takeRight(xs: String, number: Int): String
          

          # Parameters

          Parameter Description
          xs: String The string
          number: Int The number n

          # Examples

          takeRight("Apple", 0) # Returns an empty string
          takeRight("Apple", 1) # Returns "A"
          takeRight("Apple", 3) # Returns "ple"
          takeRight("Apple", 5) # Returns "Apple"
          takeRight("Apple", 15) # Returns "Apple"
          
          Math Functions
          Union Functions
          Math Functions
          Union Functions