> 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/arraymap.md). # ArrayMap Iterates over every entry of the array and calls the closure function to work on the element of the array. The returned value will be set at the same index in a new array and the new array will be returned ## Method Signature ``` ArrayMap(array=[array], callback=[function:Function], parallel=[boolean], maxThreads=[any], virtual=[boolean]) ``` ### Arguments | Argument | Type | Required | Description | Default | | ------------ | ------------------- | -------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------- | | `array` | `array` | `true` | The array to reduce | | | `callback` | `function:Function` | `true` |

The function to invoke for each item. The function will be passed 3 arguments: the current item, and the
current index, and the original array. You can alternatively pass a Java Function which will only receive the 1st arg. The function should return the value that will be set at the same index in the new array.

| | | `parallel` | `boolean` | `false` | If true, the function will be invoked in parallel using multiple threads. Defaults to false. | `false` | | `maxThreads` | `any` | `false` | The maximum number of threads to use when parallel is true. If not provided the common thread pool will be used. If a boolean value is passed, it will be assigned as the virtual argument. | | | `virtual` | `boolean` | `false` | If true, the function will be invoked using virtual thread. Defaults to false. Ingored if parallel is false. | `false` | ## Examples ### Script Syntax [Run Example](https://try.boxlang.io/?code=eJxLzs8tyEmtcEksSVSwVYhW4OKs5uLkdFSwUjDh4qzVQXANLVD5poZAPlesNVdearljUVFiJVB7Ioj2TSzQUEhGGKujoKHgmFepkFmSmqugqWBrpwA0oii1pLQoDyym52jNVaugac1VXgTkupTmArXDzQQKAwAMuCw5) ```java complexData = [ { A : 4 }, { A : 18 }, { A : 51 } ]; newArray = arrayMap( complexData, ( Any item ) => { return item.A; } ); writeDump( newArray ); ``` Result: \[4, 18, 51] ### Additional Examples [Run Example](https://try.boxlang.io/?code=eJy1jk0LgkAQhs%2B7v2LYk4IkeUwMvAZ26RgdJh3Jw46xupSE%2F739APsF3R5m5p33wTNqmqCCK0ihGjStnVTm8IIGH4FO40T9wKTkrZSd1c8EMKbSUjK9Au%2FdCzQGlwa3fQYJ1LzAMJPOInFH74juGFKojvCRwtBsDXsSil1SwSGEpFhLufqaWPsrc6M8B036TgZ6y%2B08jLzJFF4m0E57nT9pFH70BQgcX4A%3D) ```java aNames = [ "Marcus", "Sarah", "Josefine" ]; dump( aNames ); newNames1 = arrayMap( aNames, ( Any item, Any index, Any arr ) => { return { "name" : item }; } ); dump( newNames1 ); // member function newNames2 = aNames.map( ( Any item, Any index, Any arr ) => { return { "name" : item }; } ); dump( newNames2 ); ``` ## 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) * [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) * [ArrayPrepend](/boxlang-language/reference/built-in-functions/array/arrayprepend.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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