Greetings my fellow Technology Advocates and Specialists.
This is the Chapter #1 of my Mastering Loops in Azure DevOps Series.
In this Session, I will walk you through The Art of Iteration: Starting the Cycle.
This is a quick start guide to introduce the topic and how it is relevant to the real world.
| CODE REPOSITORY:- |
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| REFERENCE LINKS:- |
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| 1. Microsoft Learn - Azure Devops - Expressions. |
| HOW DOES MY CODE PLACEHOLDER LOOKS LIKE:-:- |
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 |
| MILLION DOLLAR QUESTION:- |
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| Question: Can we use "Loop" in Azure Devops YAML Pipeline ? |
| Answer: YES |
| HOW ? |
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| Concise summary follows below:- |
1.) We can use "Loop" in Azure Devops YAML Pipeline by using the "each" keyword. |
2.) We can use the "each" keyword to loop through a) Parameters with the type as b) Object. |
3.) Additionally, you can iterate through Nested elements within an Object. |
| EXAMPLE:- |
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| PIPELINE CODE SNIPPET:- |
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| AZURE DEVOPS YAML PIPELINE (azure-pipelines-Leverage-Loops-For-Automation-Initial-Test.yml):- |
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trigger:
none
######################
#DECLARE PARAMETERS:-
######################
parameters:
- name: RGNAME
displayName: Please Provide the Resource Group Name:-
type: object
default: [AMRG001,AMRG002,AMRG003]
######################
#DECLARE VARIABLES:-
######################
variables:
BuildAgent: windows-latest
#########################
# Declare Build Agents:-
#########################
pool:
vmImage: $(BuildAgent)
###################
# Declare Stages:-
###################
stages:
- ${{ each rg in parameters.RGNAME }}:
- stage: CREATE_${{ rg }}
jobs:
- job: CreateResourceGroup
steps:
- script: echo "Creating "${{ rg }}""
| EXPLANATION:- |
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I.) Declare "Parameter" of type "Object". In this example, I have declared 3 values (Resource Group Names) as an array.
######################
#DECLARE PARAMETERS:-
######################
parameters:
- name: RGNAME
displayName: Please Provide the Resource Group Name:-
type: object
default: [AMRG001,AMRG002,AMRG003]
II.) Declare "Each" at beginning of the Pipeline stage. The "rg" variable stores all the values that the "each" keyword iterates over in the parameter of type object.
stages:
- ${{ each rg in parameters.RGNAME }}:
III.) As there are 3 values declared in "Parameter" of type "Object", there will be 3 STAGES CREATED.
IV.) Name of each stage will be one of iterated value from the array declared in "Parameter" of type "Object".
- stage: CREATE_${{ rg }}
V.) Finally, each stage displays the Value in the console.
steps:
- script: echo "Creating "${{ rg }}""
| OUTPUT OF EXAMPLE:- |
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| 1. As in the example, there were 3 values declared in "Parameter" of type "Object", hence 3 STAGES got created. |
 |
| 2. Name of each stage is the iterated value from the array declared in "Parameter" of type "Object". |
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| 3. Each stage displays the Value in the console. |
STAGE #1: CREATE_AMRG001 |
 |
STAGE #2: CREATE_AMRG002 |
 |
STAGE #3: CREATE_AMRG003 |
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Hope You Enjoyed the Session!!!
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