Arrays and list functions

Use these functions to make interaction with arrays, lists, and strings easier.

Distinct

The distinct function is used to get values from an array or list with duplicate values removed.

Format

{%= distinct(array) %}

Example

The following operation specifies people who have placed orders in more than one store.

{%= distinct(person.orders.storeId).count() > 1 %}

The head function is used to return the first item in the array or list.

Format

{%= head({array}) %}

Example

The following operation returns the first of the top five orders with the highest price. More information about the topN function can be found in the first n in array section.

{%= head(topN(orders,price, 5)) %}

First n in array

The topN function is used to return the first N items in an array, when sorted in ascending order based on the given numerical expression.

Format

{%= topN(array, value, amount) %}
Argument Description
{ARRAY} The array or list that is to be sorted.
{VALUE} The property in which to sort the array or list.
{AMOUNT} The number of items to be returned.

Example

The following operation returns the top five orders with the highest price.

{%= topN(orders,price, 5) %}

In

The in function is used to determine if an item is a member of an array or list.

Format

{%= in(value, array) %}

Example

The following operation defines people with birthdays in March, June, or September.

{%= in (person.birthMonth, [3, 6, 9]) %}

Includes

The includes function is used to determine if an array or list contains a given item.

Format

{%= includes(array,item) %}

Example

The following operation defines people whose favorite color includes red.

{%= includes(person.favoriteColors,"red") %}

Intersects

The intersects function is used to determine if two arrays or lists have at least one common member.

Format

{%= intersects(array1, array2) %}

Example

The following operation defines people whose favorite colors include at least one of red, blue, or green.

{%= intersects(person.favoriteColors,["red", "blue", "green"]) %}

Last n in array

The bottomN function is used to return the last N items in an array, when sorted in ascending order based on the given numerical expression.

Format

{%= bottomN(array, value, amount) %}
Argument Description
{ARRAY} The array or list that is to be sorted.
{VALUE} The property in which to sort the array or list.
{AMOUNT} The number of items to be returned.

Example

The following operation returns the top five orders with the lowest price.

{%= bottomN(orders,price, 5) %}

Not in

The notIn function is used to determine if an item is not a member of an array or list.

NOTE

The notIn function also ensures that neither value is equal to null. Therefore, the results are not an exact negation of the in function.

Format

{%= notIn(value, array) %}

Example

The following operation defines people with birthdays that are not in March, June, or September.

{%= notIn(person.birthMonth ,[3, 6, 9]) %}

Subset of

The subsetOf function is used to determine if a specific array (array A) is a subset of another array (array B). In other words, that all elements in array A are elements of array B.

Format

{%= subsetOf(array1, array2) %}

Example

The following operation defines people who have visited all of their favorite cities.

{%= subsetOf(person.favoriteCities,person.visitedCities) %}

Superset of

The supersetOf function is used to determine if a specific array (array A) is a superset of another array (array B). In other words, that array A contains all elements in array B.

Format

{%= supersetOf(array1, array2) %}

Example

The following operation defines people who have eaten sushi and pizza at least once.

{%= supersetOf(person.eatenFoods,["sushi", "pizza"] %}

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