DevOps / Apache Groovy Interview questions

What is the Elvis operator in Groovy?

The Elvis operator, written ?:, is shorthand for returning a value if it's truthy, or a default otherwise - value ?: default is equivalent to the longer value ? value : default, without writing the checked value twice.

It's commonly used to provide fallback values, like name = inputName ?: "Unknown", where inputName being null or empty falls back to the default string.

It relies on Groovy Truth to decide whether the left-hand value counts as "present," so it treats not just null but also empty strings, empty collections, and zero as falsy, not only null specifically.

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The Elvis operator ?: is shorthand for: a null-check that always throws if the value is null

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value ? value : default, without repeating the value

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string concatenation only

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The Elvis operator relies on: exact object identity comparison

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Groovy Truth to decide what counts as falsy

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only checking for exact null

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DevOps / Apache Groovy Interview questions

What is the Elvis operator in Groovy?

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