Boxlang 1.x Stable Released
BoxLang : A Modern Dynamic JVM Language
LogoLogo
APIDocsDownloadTrySourceSupport
  • Introduction
    • Contributing Guide
    • Release History
      • 1.1.0
      • 1.0.1
      • 1.0.0
      • RC Stage
        • 1.0.0-RC.1
        • 1.0.0-RC.2
        • 1.0.0-RC.3
      • Beta Stage
        • 1.0.0-Beta27
        • 1.0.0-Beta26
        • 1.0.0-Beta25
        • 1.0.0-Beta24
        • 1.0.0-Beta23
        • 1.0.0-Beta22
        • 1.0.0-Beta21
        • 1.0.0-Beta20
        • 1.0.0-Beta19
        • 1.0.0-Beta18
        • 1.0.0-Beta17
        • 1.0.0-Beta16
        • 1.0.0-Beta15
        • 1.0.0-Beta14
        • 1.0.0-Beta13
        • 1.0.0-Beta12
        • 1.0.0-Beta11
        • 1.0.0-Beta10
        • 1.0.0-Beta9
        • 1.0.0-Beta8
        • 1.0.0-Beta7
        • 1.0.0-Beta6
        • 1.0.0-Beta5
        • 1.0.0-Beta 4
        • 1.0.0-Beta3
        • 1.0.0-Beta2
    • About This Book
      • Authors
  • Getting Started
    • Overview
      • Multi-Runtime
      • Instructions & Interpreters
      • CommandBox CLI
      • Quick Syntax Guide
        • Differences From CFML
      • Frequently Asked Questions
      • Running ColdFusion/CFML Apps
        • Migrating from Adobe ColdFusion
        • Migrating From Lucee CFML
    • Installation
      • Modules
    • Running BoxLang
      • AWS Lambda
      • CommandBox
      • Chromebooks
      • CLI Scripting
      • Docker
      • JSR-223 Scripting
      • MiniServer
      • Try BoxLang!
    • BoxLang Cloud Servers
      • Microsoft Azure
      • Amazon Web Services
    • IDE & Tooling
      • BoxLang Debugger
        • MiniServer Debugging
        • CommandBox Debugging
      • BoxLang Compiler
      • CFML Feature Audit
      • CFML to BoxLang Transpiler
    • Runtime Configuration
      • Directives
      • Caches
      • Datasources
      • Experimental
      • Executors
      • Logging
      • Modules
      • Security
  • BoxLang Language
    • Program Structure
    • Syntax & Semantics
      • Comments
      • Variables
      • Variable Scopes
      • Operators
      • Null & Nothingness
      • Strings
      • Numbers
      • JSON
      • Arrays
      • Structures
      • Queries
      • Datasources
      • Conditionals
      • Attempts
      • Data Navigators
      • Exception Management
      • Code Locking
      • Closures => Context Aware
      • Lambdas -> Pure Functions
      • Includes
      • Threading
    • Classes & O.O.
      • Properties
      • Functions
      • Static Constructs
      • Final Constructs
      • Abstract Constructs
      • Interfaces
    • Reference
      • API Docs
      • Lexical Elements
        • Scopes and Constants
        • Keywords
        • Operators
        • Literals
        • Comments
        • Tokens
        • Semicolons
        • Identifiers
        • Packages and Imports
        • Java Interoperability
        • Errors
      • Types
        • array
        • class
        • date
        • datetime
        • file
        • numeric
        • query
        • stream
        • string
        • struct
        • xml
      • Built-in Functions
        • array
          • ArrayAppend
          • ArrayAvg
          • ArrayClear
          • ArrayContains
          • ArrayContainsNoCase
          • ArrayDelete
          • ArrayDeleteAt
          • ArrayDeleteNoCase
          • ArrayEach
          • ArrayEvery
          • ArrayFilter
          • ArrayFind
          • ArrayFindAll
          • ArrayFindAllNoCase
          • ArrayFindNoCase
          • ArrayFirst
          • ArrayGetMetadata
          • ArrayIndexExists
          • ArrayInsertAt
          • ArrayIsDefined
          • ArrayLast
          • ArrayMap
          • ArrayMax
          • ArrayMedian
          • ArrayMerge
          • ArrayMid
          • ArrayMin
          • ArrayNew
          • ArrayPop
          • ArrayPrepend
          • ArrayPush
          • ArrayRange
          • ArrayReduce
          • ArrayReduceRight
          • ArrayResize
          • ArrayReverse
          • ArraySet
          • ArrayShift
          • ArraySlice
          • ArraySome
          • ArraySort
          • ArraySplice
          • ArraySum
          • ArraySwap
          • ArrayToList
          • ArrayToStruct
          • ArrayUnshift
        • async
          • ExecutorGet
          • ExecutorHas
          • ExecutorList
          • ExecutorNew
          • ExecutorShutdown
          • ExecutorStatus
          • FutureNew
          • IsInThread
          • RunAsync
          • ThreadJoin
          • ThreadNew
          • ThreadTerminate
        • bifs
          • BoxLangBIFProxy
        • binary
          • BinaryDecode
          • BinaryEncode
          • BitAnd
          • BitMaskClear
          • BitMaskRead
          • BitMaskSet
          • BitNot
          • BitOr
          • bitShln
          • bitShrn
          • BitXor
        • cache
          • Cache
          • CacheFilter
          • CacheNames
          • CacheProviders
          • CacheService
        • cli
          • CLIExit
          • CLIGetArgs
          • CLIRead
        • conversion
          • DataNavigate
          • JSONDeserialize
          • JSONPrettify
          • JSONSerialize
          • LSParseNumber
          • ParseNumber
          • ToBase64
          • ToBinary
          • ToModifiable
          • ToNumeric
          • ToScript
          • ToString
          • ToUnmodifiable
        • decision
          • ArrayIsEmpty
          • Attempt
          • IsArray
          • IsBinary
          • IsBoolean
          • IsClosure
          • IsCustomFunction
          • IsDate
          • IsDateObject
          • IsDebugMode
          • IsDefined
          • IsEmpty
          • IsFileObject
          • IsIPv6
          • IsJSON
          • IsLeapYear
          • IsLocalHost
          • IsNull
          • IsNumeric
          • IsNumericDate
          • IsObject
          • IsQuery
          • IsSimpleValue
          • IsStruct
          • IsValid
          • IsXML
          • IsXmlAttribute
          • IsXMLDoc
          • IsXMLElem
          • IsXMLNode
          • IsXMLRoot
          • LSIsNumeric
          • structIsEmpty
        • encryption
          • Decrypt
          • Encrypt
          • EncryptBinary
          • GeneratePDBKDFKey
          • GenerateSecretKey
          • Hash
          • Hash40
          • Hmac
        • format
          • BooleanFormat
          • DecimalFormat
          • LSNumberFormat
          • NumberFormat
        • i18n
          • ClearLocale
          • CurrencyFormat
          • GetLocale
          • GetLocaleDisplayName
          • GetLocaleInfo
          • IsCurrency
          • LSCurrencyFormat
          • LSIsCurrency
          • LSParseCurrency
          • ParseCurrency
          • SetLocale
        • io
          • ContractPath
          • CreateTempDirectory
          • CreateTempFile
          • DirectoryCopy
          • DirectoryCreate
          • DirectoryDelete
          • DirectoryExists
          • DirectoryList
          • DirectoryMove
          • DirectoryRename
          • ExpandPath
          • FileAppend
          • FileClose
          • FileCopy
          • FileDelete
          • FileExists
          • FileGetMimeType
          • FileInfo
          • FileIsEOF
          • FileMove
          • FileOpen
          • FileRead
          • FileReadBinary
          • FileReadLine
          • FileSeek
          • FileSetAccessMode
          • FileSetAttribute
          • FileSetLastModified
          • FileSkipBytes
          • FileWrite
          • FileWriteLine
          • GetCanonicalPath
          • GetDirectoryFromPath
          • GetFileInfo
          • getTempFile
        • java
          • CreateDynamicProxy
        • jdbc
          • IsInTransaction
          • IsWithinTransaction
          • PreserveSingleQuotes
          • QueryExecute
          • TransactionCommit
          • TransactionRollback
          • TransactionSetSavepoint
        • list
          • GetToken
          • ListAppend
          • ListAvg
          • ListChangeDelims
          • ListCompact
          • ListContains
          • ListContainsNoCase
          • ListDeleteAt
          • ListEach
          • ListEvery
          • ListFilter
          • ListFind
          • ListFindNoCase
          • ListFirst
          • ListGetAt
          • ListIndexExists
          • ListInsertAt
          • ListItemTrim
          • ListLast
          • ListLen
          • ListMap
          • ListPrepend
          • ListQualify
          • ListReduceRight
          • ListRemoveDuplicates
          • ListRest
          • ListSetAt
          • ListSome
          • ListSort
          • ListToArray
          • ListTrim
          • ListValueCount
          • ListValueCountNoCase
        • math
          • Abs
          • Acos
          • Asin
          • Atn
          • Ceiling
          • Cos
          • DecrementValue
          • Exp
          • Fix
          • Floor
          • FormatBaseN
          • IncrementValue
          • InputBaseN
          • Int
          • Log
          • Log10
          • Max
          • Min
          • Pi
          • PrecisionEvaluate
          • Rand
          • Randomize
          • RandRange
          • Round
          • Sgn
          • Sin
          • Sqr
          • Tan
        • query
          • QueryAddColumn
          • QueryAddRow
          • QueryAppend
          • QueryClear
          • QueryColumnArray
          • QueryColumnCount
          • QueryColumnData
          • QueryColumnExists
          • QueryColumnList
          • QueryCurrentRow
          • QueryDeleteColumn
          • QueryDeleteRow
          • QueryEach
          • QueryEvery
          • QueryFilter
          • QueryGetCell
          • QueryGetResult
          • QueryInsertAt
          • QueryKeyExists
          • QueryMap
          • QueryNew
          • QueryPrepend
          • QueryRecordCount
          • QueryReduce
          • QueryRegisterFunction
          • QueryReverse
          • QueryRowData
          • QueryRowSwap
          • QuerySetCell
          • QuerySetRow
          • QuerySlice
          • QuerySome
          • QuerySort
        • string
          • Ascii
          • CamelCase
          • Char
          • CharsetDecode
          • CharsetEncode
          • Compare
          • CompareNoCase
          • Find
          • FindNoCase
          • FindOneOf
          • Insert
          • JSStringFormat
          • KebabCase
          • LCase
          • Left
          • ListReduce
          • LJustify
          • LTrim
          • Mid
          • ParagraphFormat
          • PascalCase
          • QueryStringToStruct
          • ReEscape
          • ReFind
          • reFindNoCase
          • ReMatch
          • reMatchNoCase
          • RemoveChars
          • RepeatString
          • Replace
          • ReplaceList
          • ReplaceListNoCase
          • ReplaceNoCase
          • ReReplace
          • reReplaceNoCase
          • Reverse
          • Right
          • RJustify
          • RTrim
          • Slugify
          • SnakeCase
          • SpanExcluding
          • SpanIncluding
          • SQLPrettify
          • StringBind
          • StringEach
          • StringEvery
          • StringFilter
          • StringMap
          • StringReduce
          • StringReduceRight
          • StringSome
          • StringSort
          • StripCR
          • Trim
          • TrueFalseFormat
          • UCase
          • UCFirst
          • Val
          • Wrap
          • YesNoFormat
        • struct
          • StructAppend
          • StructClear
          • StructCopy
          • StructDelete
          • StructEach
          • StructEquals
          • StructEvery
          • StructFilter
          • StructFind
          • StructFindKey
          • StructFindValue
          • StructGet
          • StructGetMetadata
          • StructInsert
          • StructIsCaseSensitive
          • StructIsOrdered
          • StructKeyArray
          • StructKeyExists
          • StructKeyList
          • StructKeyTranslate
          • StructMap
          • StructNew
          • StructReduce
          • StructSome
          • StructSort
          • StructToQueryString
          • StructToSorted
          • StructUpdate
          • StructValueArray
        • system
          • ApplicationRestart
          • ApplicationStartTime
          • ApplicationStop
          • BoxAnnounce
          • BoxAnnounceAsync
          • BoxRegisterInterceptionPoints
          • BoxRegisterInterceptor
          • BoxRegisterRequestInterceptor
          • CallStackGet
          • CreateGUID
          • CreateObject
          • CreateUUID
          • DE
          • DebugBoxContexts
          • Dump
          • Duplicate
          • echo
          • EncodeForHTML
          • GetApplicationMetadata
          • GetBaseTagData
          • GetBaseTagList
          • GetBaseTemplatePath
          • GetBoxContext
          • GetBoxRuntime
          • GetBoxVersionInfo
          • GetClassMetadata
          • GetComponentList
          • GetContextRoot
          • GetCurrentTemplatePath
          • GetFileFromPath
          • GetFunctionCalledName
          • GetFunctionList
          • GetModuleInfo
          • GetModuleList
          • GetRequestClassLoader
          • GetSemver
          • GetSystemSetting
          • GetTempDirectory
          • GetTickCount
          • htmlEditFormat
          • IIF
          • Invoke
          • IsInstanceOf
          • JavaCast
          • ObjectDeserialize
          • ObjectSerialize
          • PagePoolClear
          • Print
          • Println
          • RunThreadInContext
          • SessionInvalidate
          • SessionRotate
          • SessionStartTime
          • Sleep
          • SystemCacheClear
          • SystemExecute
          • SystemOutput
          • Throw
          • Trace
          • URLDecode
          • URLEncodedFormat
          • writeDump
          • WriteLog
          • WriteOutput
        • temporal
          • ClearTimezone
          • CreateDate
          • CreateDateTime
          • CreateODBCDate
          • CreateODBCDateTime
          • CreateODBCTime
          • CreateTime
          • CreateTimeSpan
          • DateAdd
          • DateCompare
          • DateConvert
          • DateDiff
          • DateFormat
          • DatePart
          • DateTimeFormat
          • Day
          • DayOfWeek
          • DayOfWeekAsString
          • DayOfWeekShortAsString
          • DayOfYear
          • DaysInMonth
          • DaysInYear
          • FirstDayOfMonth
          • GetNumericDate
          • GetTime
          • GetTimezone
          • GetTimezoneInfo
          • Hour
          • Millisecond
          • Minute
          • Month
          • MonthAsString
          • MonthShortAsString
          • Nanosecond
          • Now
          • Offset
          • ParseDateTime
          • Quarter
          • Second
          • SetTimezone
          • TimeFormat
          • Week
          • Year
        • type
          • ArrayLen
          • GetMetaData
          • Len
          • NullValue
          • StringLen
          • StructCount
        • web
          • HtmlHead
          • GetHTTPTimeString
          • GetHTTPRequestData
          • HtmlFooter
          • SetEncoding
          • Forward
          • Location
          • GetPageContext
          • FileUpload
          • FileUploadAll
        • xml
          • XMLChildPos
          • XMLElemNew
          • XMLFormat
          • XMLGetNodeType
          • XMLNew
          • XMLParse
          • XMLSearch
          • XMLTransform
          • XMLValidate
        • zip
          • Compress
          • Extract
          • IsZipFile
      • Components
        • async
          • Thread
        • cache
          • Cache
        • debug
          • Stopwatch
          • Timer
        • io
          • Directory
          • File
        • jdbc
          • DBInfo
          • ProcParam
          • ProcResult
          • Query
          • QueryParam
          • StoredProc
          • Transaction
        • net
          • HTTP
          • HTTPParam
        • system
          • Abort
          • Application
          • Associate
          • Component
          • Dump
          • Execute
          • Exit
          • Flush
          • Include
          • Invoke
          • InvokeArgument
          • Lock
          • Log
          • Loop
          • Object
          • Output
          • Param
          • ProcessingDirective
          • SaveContent
          • Setting
          • Silent
          • Sleep
          • Throw
          • Trace
        • web
          • HtmlHead
          • HtmlFooter
          • Location
          • Cookie
          • Header
          • Content
        • xml
          • XML
        • zip
          • Zip
      • Exceptions
  • BoxLang Framework
    • Application.bx
    • Asynchronous Programming
    • File Handling
    • Interceptors
      • Core Interception Points
        • Application Events
        • Cache Service Events
        • Cache Provider Events
        • Cache Object Store Events
        • Datasource Service Events
        • Dump Events
        • Dynamic Object Events
        • Function Invocations
        • HTTP Events
        • Life-cycle Events
        • Logging Events
        • Module Events
        • Module Service Events
        • Object Marshalling Events
        • Query Invocations
        • Runtime Events
        • Request Context Events
        • Scheduler Events
        • Scheduler Service Events
        • Template Invocations
        • Transaction Events
      • Request Interception Points
    • HTTP/S Calls
    • Java Interop
    • JDBC Transactions
    • Modules
      • AI
      • Compat CFML
        • Reference
          • Types
            • array
            • datetime
            • numeric
            • string
            • struct
          • Built-in Functions
            • cache
              • CacheCount
              • CacheGetAsAttempt
              • CacheRegionRemove
              • CacheRemoveAll
              • CachePut
              • CacheRegionExists
              • CacheGetSession
              • CacheGetEngineProperties
              • CacheGet
              • CacheGetDefaultCacheName
              • CacheGetProperties
              • CacheSetProperties
              • CacheGetAllIds
              • CacheIdExists
              • cacheKeyExists
              • CacheRemove
              • cacheDelete
              • CacheGetAll
              • CacheGetMetadata
              • CacheGetOrFail
              • CacheClear
              • CacheRegionNew
            • conversion
              • JSONDeserialize
            • encryption
              • Hash
              • Hash40
            • format
              • HTMLCodeFormat
              • DollarFormat
            • struct
              • DeleteClientVariable
            • system
              • Throw
              • ObjectSave
              • GetFunctionData
              • GetComponentMetadata
              • GetVariable
              • GetTagData
              • GetClientVariablesList
              • GetContextRoot
              • ObjectLoad
              • SetVariable
            • temporal
              • LSWeek
              • LSDayOfWeek
              • LSIsDate
              • DateCompare
              • GetHTTPTimestring
              • LSDateTimeFormat
              • LSDateFormat
              • LSTimeFormat
              • DayOfWeekAsString
              • DayOfWeekShortAsString
              • MonthAsString
              • MonthShortAsString
              • ToLegacyDate
              • createDate
              • LSParseDateTime
              • DateTimeFormat
              • DateFormat
              • TimeFormat
            • type
              • GetMetaData
          • Components
            • net
              • HTTP
      • CSRF
      • ESAPI
      • Evaluating Code
      • FTP
      • Image Manipulation
      • INI Files
      • JDBC
      • Jython
      • Mail
      • Markdown
      • ORM
      • OSHI - Operating System + Hardware
      • Password Encryption
      • PDF
      • Redis
      • UI Forms
      • WDDX
      • Web Support
      • Yaml
  • Extra Credit
    • MVC
    • Dependency Injection
Powered by GitBook
LogoLogo

Social Media

  • X
  • FaceBook
  • LinkedIn
  • YouTube

Bug Tracking

  • Runtimes
  • IDE
  • Modules

Support

  • Professional
  • Community
  • Slack

Copyright & Register Trademark by Ortus Solutions, Corp

On this page
  • Component Signature
  • Attributes
  • Examples

Was this helpful?

Edit on GitHub
Export as PDF
  1. BoxLang Language
  2. Reference
  3. Components
  4. system

Param

Tests for a parameter's existence, tests its data type, and, if a default value is not assigned, optionally provides one.

Component Signature

<bx:Param name=[string]
type=[string]
default=[any]
max=[numeric]
min=[numeric]
pattern=[string] />

Attributes

Atrribute
Type
Required
Description
Default

name

string

true

The name of the parameter

type

string

false

The data type of the parameter

default

any

false

The default value of the parameter

max

numeric

false

The maximum value of the parameter

min

numeric

false

The minimum value of the parameter

pattern

string

false

The pattern of the parameter

Examples

<bx:Param name=[string]
type=[string]
default=[any]
max=[numeric]
min=[numeric]
pattern=[string] />
PreviousOutputNextProcessingDirective

Last updated 3 months ago

Was this helpful?