@@ -4,7 +4,7 @@ description: Describes the lambda functions to use in an Azure Resource Manager
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author : mumian
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ms.topic : conceptual
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ms.author : jgao
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- ms.date : 02/07 /2023
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+ ms.date : 02/06 /2023
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---
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# Lambda functions for ARM templates
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### Examples
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- The following examples show how to use the ` filter ` function.
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+ The following examples show how to use the filter function.
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``` json
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{
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### Example
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- The following example shows how to use the ` map ` function.
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+ The following example shows how to use the map function.
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``` json
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{
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### Example
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- The following examples show how to use the ` reduce ` function.
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+ The following examples show how to use the reduce function.
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``` json
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{
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### Example
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- The following example shows how to use the ` sort ` function.
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+ The following example shows how to use the sort function.
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``` json
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{
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| ---- | ---- | ----- |
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| dogsByAge | Array | [ {"name":"Indy","age":2,"interests":[ "Butter"] },{"name":"Casper","age":3,"interests":[ "Other dogs"] },{"name":"Evie","age":5,"interests":[ "Ball","Frisbee"] },{"name":"Kira","age":8,"interests":[ "Rubs"] }] |
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- ## toObject
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- ` toObject(inputArray, lambda expression, [lambda expression]) `
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- Converts an array to an object with a custom key function and optional custom value function.
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- In Bicep, use the [ toObject] ( ../bicep/bicep-functions-lambda.md#toobject ) function.
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- ### Parameters
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- | Parameter | Required | Type | Description |
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- | :--- | :--- | :--- | :--- |
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- | inputArray | Yes | array | The array used for creating an object.|
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- | lambda expression | Yes | expression | The lambda expression used to provide the key predicate.|
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- | lambda expression | No | expression | The lambda expression used to provide the value predicate.|
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-
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- ### Return value
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- An object.
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- ### Example
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- The following example shows how to use the ` toObject ` function with the two required parameters:
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- ``` json
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- {
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- "$schema" : " https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#" ,
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- "contentVersion" : " 1.0.0.0" ,
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- "variables" : {
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- "dogs" : [
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- {
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- "name" : " Evie" ,
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- "age" : 5 ,
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- "interests" : [
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- " Ball" ,
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- " Frisbee"
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- ]
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- },
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- {
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- "name" : " Casper" ,
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- "age" : 3 ,
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- "interests" : [
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- " Other dogs"
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- ]
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- },
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- {
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- "name" : " Indy" ,
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- "age" : 2 ,
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- "interests" : [
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- " Butter"
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- ]
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- },
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- {
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- "name" : " Kira" ,
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- "age" : 8 ,
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- "interests" : [
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- " Rubs"
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- ]
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- }
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- ]
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- },
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- "resources" : {},
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- "outputs" : {
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- "dogsObject" : {
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- "type" : " object" ,
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- "value" : " [toObject(variables('dogs'), lambda('entry', lambdaVariables('entry').name))]"
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- }
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- }
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- }
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- ```
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- The preceding example generates an object based on an array.
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- | Name | Type | Value |
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- | ---- | ---- | ----- |
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- | dogsObject | Object | {"Evie":{"name":"Evie","age":5,"interests":[ "Ball","Frisbee"] },"Casper":{"name":"Casper","age":3,"interests":[ "Other dogs"] },"Indy":{"name":"Indy","age":2,"interests":[ "Butter"] },"Kira":{"name":"Kira","age":8,"interests":[ "Rubs"] }} |
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- The following ` toObject ` function provides the same output.
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- ``` json
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- "outputs" : {
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- "dogsObject" : {
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- "type" : " object" ,
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- "value" : " [toObject(variables('dogs'), lambda('entry', lambdaVariables('entry').name), lambda('entry', lambdaVariables('entry')))]"
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- }
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- }```
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- The following example shows how to use the `toObject` function with three parameters.
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- ```json
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- {
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- "$schema" : " https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#" ,
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- "contentVersion" : " 1.0.0.0" ,
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- "variables" : {
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- "dogs" : [
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- {
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- "name" : " Evie" ,
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- "properties" : {
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- "age" : 5 ,
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- "interests" : [
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- " Ball" ,
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- " Frisbee"
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- ]
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- }
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- },
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- {
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- "name" : " Casper" ,
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- "properties" : {
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- "age" : 3 ,
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- "interests" : [
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- " Other dogs"
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- ]
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- }
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- },
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- {
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- "name" : " Indy" ,
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- "properties" : {
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- "age" : 2 ,
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- "interests" : [
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- " Butter"
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- ]
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- }
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- },
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- {
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- "name" : " Kira" ,
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- "properties" : {
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- "age" : 8 ,
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- "interests" : [
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- " Rubs"
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- ]
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- }
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- }
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- ]
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- },
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- "resources" : {},
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- "outputs" : {
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- "dogsObject" : {
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- "type" : " object" ,
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- "value" : " [toObject(variables('dogs'), lambda('entry', lambdaVariables('entry').name), lambda('entry', lambdaVariables('entry').properties))]"
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- }
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- }
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- }
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- ```
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- The preceding example generates an object based on an array.
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- | Name | Type | Value |
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- | ---- | ---- | ----- |
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- | dogsObject | Object | {"Evie":{"age":5,"interests":[ "Ball","Frisbee"] },"Casper":{"age":3,"interests":[ "Other dogs"] },"Indy":{"age":2,"interests":[ "Butter"] },"Kira":{"age":8,"interests":[ "Rubs"] }} |
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## Next steps
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- See [ Template functions - arrays] ( ./template-functions-array.md ) for additional array related template functions.
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