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Introduction

The ternary operator, also known as the conditional operator, is a shorthand notation for expressing conditional statements in various programming languages. It takes three operands and allows you to evaluate a condition and choose one of two expressions to execute based on the result of the condition.

The syntax of the ternary operator is generally as follows:

condition ? expression1 : expression2

Here's how it works:

  1. The "condition" is an expression that evaluates to either true or false.

  2. If the condition is true, the expression before the colon (" : ") is executed and becomes the value of the entire expression.

  3. If the condition is false, the expression after the colon is executed and becomes the value of the entire expression.

Problem Statement​

Let's take an example for ternary operators:

Create a trigger for a CD pipeline and it should automatically pick the tag value <+trigger.payload.tag> when pipeline is executed via trigger and it should pick <+pipeline.variables.tag> when the pipeline is executed manually.

Resolution​

For the above usecase we should use Ternary operators /docs/platform/variables-and-expressions/harness-variables/#ternary-operators

You can give a condition :

<+condition?<value_if_true>:<value_if_false>>

For the true condition <+pipeline.triggerType> should be WEHOOK_CUSTOM /docs/platform/variables-and-expressions/harness-variables/#pipelinetriggertype and for the false condition you can put a runtime input <+input> or a pipeline varibale

Finally the ternary operator condition should look like:

<+<+pipeline.triggerType>=="MANUAL"?<+pipeline.variables.tag>:<+trigger.payload.tag>>

Another Case: Use Default Value Based in a Trigger's Payload​

Suppose we have a trigger that provides a runtime input for a pipeline based on the trigger's payload.

Normally, in the trigger's runtime input form, we would have this:

myVariable: <+trigger.payload.myVariable>

If we want to provide a default value for myVariable when it is missing from the trigger's payload, we can use the following in the trigger's runtime input form:

<+<+trigger.payload>.contains("myVariable")?<+trigger.payload.myVariable>:"DEFAULT_VALUE">

This ensures that the value for myVariable is provided as "DEFAULT_VALUE" in case the "myVariable" entry is not present in the trigger's payload.