清單函式 list-functions

differenceLists(listString,listString)： listString

differenceLists(listInteger,listInteger)： listInteger

differenceLists(listDecimal,listDecimal)： listDecimal

differenceLists(listBoolean,listBoolean)：清單布林值

differenceLists(listDuration,listDuration)： listDuration

differenceLists(listDateTime,listDateTime)： listDateTime

differenceLists(listDateTimeOnly,listDateTimeOnly)： listDateTimeOnly

differenceLists(listDateOnly,listDateOnly)： listDateOnly

differenceLists(['a','b','c'], ['b'])

傳回['a','c']。

differenceLists(['a','a','b'], [])

傳回['a','b']。

differenceLists([], ['a'])

傳回[]。

distinct(<listInteger>)

傳回整數清單。

distinct(<listDecimal>)

傳回小數點清單。

distinct(<listString>)

傳回字串清單。

distinct(<listDateTimeOnly>)

傳回日期時間清單，不考慮時區。

distinct(<listDateTime>)

傳回日期時間清單。

distinct(<listDateOnly>)

傳回日期清單。

distinct(<listBoolean>)

傳回布林值清單。

distinct(<listDuration>)

傳回持續時間清單。

distinct(<listObject>)

distinct(<listObject>,<string>)

傳回物件清單。

distinct([10,2,10,null])

傳回[10, 2]。

distinctWithNull(<listInteger>)

傳回整數清單。

distinctWithNull(<listDecimal>)

傳回小數點清單。

distinctWithNull(<listString>)

傳回字串清單。

distinctWithNull(<listDateTimeOnly>)

傳回日期時間清單，不考慮時區。

distinctWithNull(<listDateTime>)

傳回日期時間清單。

distinctWithNull(<listDateOnly>)

傳回日期清單。

distinctWithNull(<listBoolean>)

傳回布林值清單。

distinctWithNull(<listDuration>)

傳回持續時間清單。

distinctWithNull([10,2,10,null])

傳回[10， 2， null]

filter(listObject, string, listString)

filter(listObject, string, listInteger)

filter(listObject, string, listDecimal)

filter(listObject, string, listDateTime)

filter(listObject, string, listDateTimeOnly)

filter(listObject, string, listDateOnly)

filter(listObject, string, listDuration)

filter(listObject, string, listBoolean)

傳回listObject。

以下是在傳入事件「myevent」中傳遞的裝載範例：

"productListItems": [{
   "id": "product1",
   "name": "the product 1",
   "price": 20
},{
   "id": "product2",
   "name": "the product 2",
   "price": 30
},{
   "id": "product3",
   "name": "the product 3",
   "price": 50
}]

您可以使用下列運算式：

filter(
 @event{myevent.productListItems},
 "id",
 ["product2", "product3", "product4"]
)

傳回listObject，其中包含以"product2"和"product3"作為ID的兩個物件。

getListItem(<listInteger>,<index>)

傳回整數。

getListItem(<listDecimal>,<index>)

傳回小數。

getListItem(<listString>,<index>)

傳回字串。

getListItem(<listDateTimeOnly>,<index>)

傳回日期時間，不考慮時區。

getListItem(<listDateTime>,<index>)

傳回日期時間。

getListItem(<listDateOnly>,<index>)

傳回日期清單。

getListItem(<listBoolean>,<index>)

傳回布林值。

getListItem(<listDuration>,<index>)

傳回持續時間。

getListItem([10, 2, 3], 1)

傳回「2」

getListItem(["A", "B", "C"], 2)

傳回「C」

具有事件欄位「event.appVersion」且值為「20.45.2.3434」的範例

split(@event{event.appVersion}, "\\.")

傳回["20", "45", "2", "3434"]

getListItem(split(@event{event.appVersion}, "\\."), 0)

傳回「20」

in(<integer>,<listInteger>)

in(<decimal>,<listDecimal>)

in(<string>,<listString>)

in(<boolean>,<listBoolean>)

in(<dateTimeOnly>,<listDateTimeOnly>)

in(<dateTime>,<listDateTime>)

in(<dateOnly>,<listDateOnly>)

in(<duration>,<listDuration>)

傳回布林值。

in(4,[4,5,3,4])

傳回true。

in(8,[4,5,3,4])

傳回false。

in(#{ExperiencePlatform.ProfileFieldGroup.profile.person.gender}, ["male"])

intersect(listString,listString)： listString

intersect(listDecimal,listDecimal)： listDecimal

intersect(listInteger,listInteger)： listInteger

intersect(listDateTime,listDateTime)： listDateTime

intersect(listDateTimeOnly,listDateTimeOnly)： listDateTimeOnly

intersect(listDateOnly,listDateOnly)： listDateOnly

intersect(listDuration,listDuration)： listDuration

intersect(listBoolean,listBoolean)：清單布林值

傳回清單。

intersect(
    ["sports", "news", "documentary"],
    ["sports", "movies", "documentary"]
)

傳回[“sports”，“news”]

intersect(
    #{ExperienceDataPlatform.profile.interests},
    ["sports", "documentary"]
)

傳回設定檔屬性和指定類別清單之間的通用專案。

intersect(
    #{ExperienceDataPlatform.profile.interests},
        @event{myEvent.sport_interests}
)

傳回設定檔屬性和指定事件欄位之間的通用專案。

limit(<listString>,<integer>)

limit(<listString>,<integer>,<boolean>)

傳回字串清單。

limit(<listInteger>,<integer>)

limit(<listInteger>,<integer>,<boolean>)

傳回整數清單。

limit(<listDecimal>,<integer>)

limit(<listDecimal>,<integer>,<boolean>)

傳回小數點清單。

limit(<listBoolean>,<integer>)

limit(<listBoolean>,<integer>,<boolean>)

傳回布林值清單。

limit(<listDateOnly>,<integer>)

limit(<listDateOnly>,<integer>,<boolean>)

傳回日期清單。

limit(<listDateTimeOnly>,<integer>)

limit(<listDateTimeOnly>,<integer>,<boolean>)

傳回日期時間清單，不考慮時區。

limit(<listDateTime>,integer>)

limit(<listDateTime>,<integer>,<boolean>)

傳回日期時間清單。

limit(<listDuration>,<integer>)

limit(<listDuration>,<integer>,<boolean>)

傳回持續時間清單。

limit(<listObject>,<integer>)

limit(<listObject>,<integer>,<boolean>)

傳回物件清單。

limit(["A", "B", "C", "D", "E"], 3)

傳回["A","B","C"]。

limit(["A", "B", "C", "D", "E"], 3, false)

傳回["C","D","E"]。

listSize(<listInteger>)

listSize(<listDecimal>)

listSize(<listString>)

listSize(<listBoolean>)

listSize(<listDateTimeOnly>)

listSize(<listDateTime>)

listSize(<listDateOnly>)

listSize(<listDuration>)

傳回整數。

listSize(<listObject>)

listSize([10,2,3])

傳回3。

listSize(@event{my_event.productListItems})

傳回給定物件陣列（listObject型別）中的物件數目。

mergeLists(listString,listString,boolean)： listString

mergeLists(listInteger,listInteger,boolean)： listInteger

mergeLists(listDecimal,listDecimal,boolean)： listDecimal

mergeLists(listBoolean,listBoolean,boolean)：清單布林值

mergeLists(listDuration,listDuration,boolean)： listDuration

mergeLists(listDateTime,listDateTime,boolean)： listDateTime

mergeLists(listDateTimeOnly,listDateTimeOnly,boolean)： listDateTimeOnly

mergeLists(listDateOnly,listDateOnly,boolean)： listDateOnly

mergeLists(['a','b'], ['b','c'], true)

傳回['a','b','c']。

mergeLists(['a','b'], ['b','c'], false)

傳回['a','b','b','c']。

serializeList(<listInteger>,<string>,<boolean>)

serializeList(<listDecimal>,<string>,<boolean>)

serializeList(<listString>,<string>,<boolean>)

serializeList(<listBoolean>,<string>,<boolean>)

serializeList(<listDateTimeOnly>,<string>,<boolean>)

serializeList(<listDateTime>,<string>,<boolean>)

serializeList(<listDateOnly>,<string>,<boolean>)

serializeList(<listDuration>,<string>,<boolean>)

傳回字串。

serializeList(["Hello","World"], " ", false)

傳回「Hello World」。

serializeList(["Hello", "World"], ",", true)

傳回"Hello"、“World”。

sort(<listInteger>,<boolean>)

傳回整數清單。

sort(<listDecimal>,<boolean>)

傳回小數點清單。

sort(<listString>,<boolean>)

傳回字串清單。

sort(<listDateTimeOnly>,<boolean>)

傳回日期時間清單，不考慮時區。

sort(<listDateTime>,<boolean>)

傳回日期時間清單。

sort(<listDateOnly>,<boolean>)

傳回日期清單。

sort(<listBoolean>,<boolean>)

傳回布林值清單。

sort(<listObject>,<string>,<boolean>)

傳回物件清單。

sort(["A", "C", "B"], true)

傳回["A","B","C"]。

sort([1, 3, 2], false)

傳回[3, 2, 1]。

sort(@event{my_event.productListItems}, "SKU", true)

傳回依SKU屬性排序的listObject （遞增順序）

This section contains structured knowledge intended to support interpretation, retrieval, and question answering related to this topic.

For complete understanding, this information should be combined with the documentation on this page. Neither source is intended to stand alone; the page describes the feature, while this section provides additional context that helps disambiguate terminology, intent, applicability, and constraints.

• TL;DR: This page documents all list functions available in AJO journey expressions, covering how to filter, sort, deduplicate, check membership, limit, serialize, merge, subtract, and find intersections of lists and arrays.

Intents:

• Remove duplicate values from a list using distinct (ignoring nulls) or distinctWithNull (preserving nulls)
• Filter a listObject to return only objects matching specific key values using filter
• Retrieve an element at a specific index from a list using getListItem
• Check whether a value exists in a list using in
• Find common elements between two lists using intersect
• Combine two lists, with or without deduplication, using mergeLists
• Subtract one list from another (set difference) using differenceLists
• Return the first or last N elements of a list using limit
• Count the total number of elements in a list using listSize
• Convert a list to a delimited string using serializeList
• Sort a list in ascending or descending order using sort

Glossary:

• listObject: A list of complex objects that must be a field reference; cannot contain null objects (product-specific)
• keyAttributeName: An optional string parameter used with distinct, filter, and sort to identify which object attribute to use for deduplication, filtering, or sorting (product-specific)
• intersect: A set operation returning only the elements present in both input lists
• mergeLists: A set operation returning the union (deduplicated) or concatenation (with duplicates) of two lists, depending on the deduplicate parameter (product-specific)
• differenceLists: A set operation returning the items of the first list that are not present in the second list (product-specific)

Guardrails:

• distinctWithNull does not support the <listObject> parameter type
• filter requires the listObject parameter to be a field reference, not an inline literal
• listSize on a listObject requires the list to be a field reference; a listObject cannot contain null objects
• serializeList does not support the listObject type
• mergeLists and differenceLists only support scalar list types (string, integer, decimal, boolean, dateTime, dateTimeOnly, dateOnly, duration); listObject is not supported
• mergeLists’s deduplicate parameter must be a literal true/false, not a dynamic boolean expression
• differenceLists always deduplicates its result; there is no option to keep duplicates

Terminology:

• Canonical name: List functions — Acronym: none — variants: collection functions, array functions
• Synonyms: “listSize” = “count list elements”; “serializeList” = “join list to string”
• Do not confuse: “distinct” (ignores nulls) ≠ “distinctWithNull” (preserves null as a distinct value)
• Do not confuse: “limit” with third parameter true (returns first N items) ≠ “limit” with false (returns last N items)
• Do not confuse: “intersect” (common elements between two lists) ≠ “filter” (elements matching specific key values)
• Do not confuse: “mergeLists” (combines two lists, union or concatenation) ≠ “differenceLists” (subtracts one list from another) ≠ “intersect” (common elements only)

FAQ:

• Q: How do I get the first 3 items of a list? — Use limit(myList, 3) or limit(myList, 3, true); the default is to return the first items.
• Q: How do I get the last 3 items of a list? — Use limit(myList, 3, false).
• Q: What is the difference between distinct and distinctWithNull? — distinct ignores null values and excludes them from the result; distinctWithNull treats null as a distinct value and includes one null entry if any nulls are present.
• Q: Can I filter a list of strings with filter? — No, filter only works on listObject; for scalar lists use in or distinct for deduplication.
• Q: How do I check if a value is in a list? — Use in(value, myList), which returns true if the value is found in the list.
• Q: Can I sort a listObject by a specific attribute? — Yes, use sort(@event{...}, "attributeName", true) where the second parameter is the attribute name and the third is the sort direction (true = ascending).
• Q: How do I combine two lists and remove duplicates? — Use mergeLists(list1, list2, true).
• Q: How do I combine two lists but keep duplicate values? — Use mergeLists(list1, list2, false).
• Q: How do I find the items in one list that are not in another? — Use differenceLists(list1, list2), which returns the items of list1 not present in list2.
• Q: What is the difference between intersect and differenceLists? — intersect returns items common to both lists; differenceLists returns items in the first list that are absent from the second list.