> For the complete documentation index, see [llms.txt](https://boxlang.ortusbooks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/array/arrayprepend.md). # ArrayPrepend Append a value to the start an array ## Method Signature ``` ArrayPrepend(array=[modifiableArray], value=[any]) ``` ### Arguments | Argument | Type | Required | Description | Default | | -------- | ----------------- | -------- | ----------------------- | ------- | | `array` | `modifiableArray` | `true` | The array to prepend to | | | `value` | `any` | `true` | The value to prepend | | ## Examples ### Prepend a value to an array Uses the arrayPrepend function to prepend a value to the beginning of an array and shifts the positions of the existing elements. [Run Example](https://try.boxlang.io/?code=eJwrzs9NdSwqSqxUsFWIVuDiNNbh4jQCYkOuWGuuRJBEQFFqQWpeioZCMUypjoKJgqY1V3lRZkmqS2luAZIUSBwA6XgYvw%3D%3D) ```java someArray = [ 3, 2, 1 ]; arrayPrepend( someArray, 4 ); writeDump( someArray ); ``` Result: \[4,3,2,1] ### Prepend a value to an array using the Array member function Invoking the prepend function on an array is the same as running arrayPrepend. [Run Example](https://try.boxlang.io/?code=eJxLyU8uyS9yLCpKrFSwVYhW4OJUck1OzkktLsnPU9IB8kJS8%2FIS80rA7ODczJIMMMs5sSAxJyVTiSvWmisFYYReQVFqQWpeioaCkkdpUYmSgqY1V3lRZkmqS2lugYYCkkqQDABQTSa%2B) ```java doctorArray = [ "Eccleston", "Tennant", "Smith", "Capaldi" ]; doctorArray.prepend( "Hurt" ); writeDump( doctorArray ); ``` Result: \['Hurt','Eccleston','Tennant','Smith','Capaldi'] ### Additional Examples [Run Example](https://try.boxlang.io/?code=eJwrzs9NdSwqSqxUsFWIVuDiNNbh4jQCYkOuWGuuRJBEQFFqQWpeioZCMUypjoKJgqY1V0ppbgGSKEhIX18hNzU3KbVIIa00L7kkMz%2BPKyU%2FuSS%2FKDwjH24LF6dSeEZmSUlidmqREtAqpZDUvLzEvBIw2wksCrIcVaNeAcwZSh6lRSVKCAegWQAUBwDY4UIY) ```java someArray = [ 3, 2, 1 ]; arrayPrepend( someArray, 4 ); dump( someArray ); // member function doctorWhoArray = [ "Whittaker", "Tennant", "Baker" ]; doctorWhoArray.prepend( "Hurt" ); dump( doctorWhoArray ); ``` ## Related * [ArrayAppend](/boxlang-language/reference/built-in-functions/array/arrayappend.md) * [ArrayAvg](/boxlang-language/reference/built-in-functions/array/arrayavg.md) * [ArrayChunk](/boxlang-language/reference/built-in-functions/array/arraychunk.md) * [ArrayClear](/boxlang-language/reference/built-in-functions/array/arrayclear.md) * [ArrayContains](/boxlang-language/reference/built-in-functions/array/arraycontains.md) * [ArrayContainsNoCase](/boxlang-language/reference/built-in-functions/array/arraycontainsnocase.md) * [ArrayDelete](/boxlang-language/reference/built-in-functions/array/arraydelete.md) * [ArrayDeleteAt](/boxlang-language/reference/built-in-functions/array/arraydeleteat.md) * [ArrayDeleteNoCase](/boxlang-language/reference/built-in-functions/array/arraydeletenocase.md) * [ArrayEach](/boxlang-language/reference/built-in-functions/array/arrayeach.md) * [ArrayEvery](/boxlang-language/reference/built-in-functions/array/arrayevery.md) * [ArrayFilter](/boxlang-language/reference/built-in-functions/array/arrayfilter.md) * [ArrayFind](/boxlang-language/reference/built-in-functions/array/arrayfind.md) * [ArrayFindAll](/boxlang-language/reference/built-in-functions/array/arrayfindall.md) * [ArrayFindAllNoCase](/boxlang-language/reference/built-in-functions/array/arrayfindallnocase.md) * [ArrayFindFirst](/boxlang-language/reference/built-in-functions/array/arrayfindfirst.md) * [ArrayFindNoCase](/boxlang-language/reference/built-in-functions/array/arrayfindnocase.md) * [ArrayFirst](/boxlang-language/reference/built-in-functions/array/arrayfirst.md) * [ArrayFlatMap](/boxlang-language/reference/built-in-functions/array/arrayflatmap.md) * [ArrayFlatten](/boxlang-language/reference/built-in-functions/array/arrayflatten.md) * [ArrayGetMetadata](/boxlang-language/reference/built-in-functions/array/arraygetmetadata.md) * [ArrayGroupBy](/boxlang-language/reference/built-in-functions/array/arraygroupby.md) * [ArrayIndexExists](/boxlang-language/reference/built-in-functions/array/arrayindexexists.md) * [ArrayInsertAt](/boxlang-language/reference/built-in-functions/array/arrayinsertat.md) * [ArrayIsDefined](/boxlang-language/reference/built-in-functions/array/arrayisdefined.md) * [ArrayLast](/boxlang-language/reference/built-in-functions/array/arraylast.md) * [ArrayMap](/boxlang-language/reference/built-in-functions/array/arraymap.md) * [ArrayMax](/boxlang-language/reference/built-in-functions/array/arraymax.md) * [ArrayMedian](/boxlang-language/reference/built-in-functions/array/arraymedian.md) * [ArrayMerge](/boxlang-language/reference/built-in-functions/array/arraymerge.md) * [ArrayMid](/boxlang-language/reference/built-in-functions/array/arraymid.md) * [ArrayMin](/boxlang-language/reference/built-in-functions/array/arraymin.md) * [ArrayNew](/boxlang-language/reference/built-in-functions/array/arraynew.md) * [ArrayNone](/boxlang-language/reference/built-in-functions/array/arraynone.md) * [ArrayPop](/boxlang-language/reference/built-in-functions/array/arraypop.md) * [ArrayPush](/boxlang-language/reference/built-in-functions/array/arraypush.md) * [ArrayRange](/boxlang-language/reference/built-in-functions/array/arrayrange.md) * [ArrayReduce](/boxlang-language/reference/built-in-functions/array/arrayreduce.md) * [ArrayReduceRight](/boxlang-language/reference/built-in-functions/array/arrayreduceright.md) * [ArrayReject](/boxlang-language/reference/built-in-functions/array/arrayreject.md) * [ArrayResize](/boxlang-language/reference/built-in-functions/array/arrayresize.md) * [ArrayReverse](/boxlang-language/reference/built-in-functions/array/arrayreverse.md) * [ArraySet](/boxlang-language/reference/built-in-functions/array/arrayset.md) * [ArrayShift](/boxlang-language/reference/built-in-functions/array/arrayshift.md) * [ArraySlice](/boxlang-language/reference/built-in-functions/array/arrayslice.md) * [ArraySome](/boxlang-language/reference/built-in-functions/array/arraysome.md) * [ArraySort](/boxlang-language/reference/built-in-functions/array/arraysort.md) * [ArraySplice](/boxlang-language/reference/built-in-functions/array/arraysplice.md) * [ArraySum](/boxlang-language/reference/built-in-functions/array/arraysum.md) * [ArraySwap](/boxlang-language/reference/built-in-functions/array/arrayswap.md) * [ArrayToList](/boxlang-language/reference/built-in-functions/array/arraytolist.md) * [ArrayToStruct](/boxlang-language/reference/built-in-functions/array/arraytostruct.md) * [ArrayTranspose](/boxlang-language/reference/built-in-functions/array/arraytranspose.md) * [ArrayUnique](/boxlang-language/reference/built-in-functions/array/arrayunique.md) * [ArrayUnshift](/boxlang-language/reference/built-in-functions/array/arrayunshift.md) * [ArrayZip](/boxlang-language/reference/built-in-functions/array/arrayzip.md) --- # Agent Instructions This documentation is published with GitBook. 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