The Elvis Operator Can Be Chained Multiple Times In A Single Expression In Lucee CFML 5.3.3.62

struct.cfm

<cfscript>

	apiResponse = {
		errors: {
			transaction: {
				key: "info.number"
			}
		}
	};

	// I had an API response object that could report several different types of errors
	// and I didn't want to build a lot of logic about picking the response apart. So,
	// I used the safe-navigation operator in conjunction with the Elvis operator to
	// try and locate the known structures.
	error = ( apiResponse?.errors?.validation?.token )
		?: apiResponse?.errors?.validation?.field
		?: apiResponse?.errors?.transaction?.key
		?: "unknown"
	;

	echo( "Error: #error#" );

</cfscript>

test.cfm

<cfscript>
	
	// The Elvis operator can be chained several times in a single expression.
	result = ( nullValue() )
		?: nullValue()
		?: nullValue()
		?: nullValue()
		?: "fall-back value"
	;

	echo( "Result: #result#" );

</cfscript>