Expression Library evaluates to ArrowFunction

[Henchway]

Hello,

i’m trying to nest a function in a map within an expression library, however what i get returned just the ‘callstack’ of the function.

Here’s the outcome:

[
{
"test":
"/* ArrowFunction @ line 5:10 */ () => __parent__.salesRegionMapper('accountableUnit', 8)"
}
]

The expression library is called like this:

lib.map.responsibleUnit['8']

Here is the expression library:

{
	"responsibleUnit": {
	   "10": "Delivery",
	   "9": "Operation",
	   "8" : () => __parent__.salesRegionMapper('accountableUnit', 8),
	   "16": "Tolling Services"
	   },
    "accountableUnit": [
	   [5, "Sales APAC"],
	   [7, "Sales EMENA"],
	   [8, "Sales EMENA"],
	   [19, "Sales LAM"],
	   [20, "Sales NAM"],
	   [21, "Sales Africa"],
	   [22, "Sales EMENA"],
	   [23, "Other"],
	   [24, "Sales EMENA"],
	   [37, "Tolling Services"],
	   [39, "Other"]   
	],
    salesRegionMapper: (mappingTable, value) => this[mappingTable].find(x => x[0] == value)[1],
}

How can i get the function to actually execute and not just be ‘listed’?

Best regards
Thomas

[bojanvelevski]

Hey @Henchway,

You just need to add parentheses at the end, that way “the function” can be treated as a proper function:

lib.map.responsibleUnit.8()

Hope this helps,
Bojan

[Henchway]

I’m afraid that also doesn’t work.

Also this wouldn’t work generally in this case, as only in case of ‘8’, the result would be a function, in any other case it would be a value.

"error":
"Map type does not have a method named: eval, found in: ...] == value)[1]). Perhaps you meant: entries, extend, filter, get, getFirst, hasOwnProperty, hasPath, isEmpty, keys, mapKeys, mapValues, merge, salesRegionMapper, toString, values"
"stacktrace":
"com.snaplogic.snap.api.ExpressionException: Map type does not have a method named: eval, found in: ...] == value)[1]). Perhaps you meant: entries, extend, filter, get, getFirst, hasOwnProperty, hasPath, isEmpty, keys, mapKeys, mapValues, merge, salesRegionMapper, toString, values\r\n\tat sl.EvaluatorUtils.undefinedMethod(EvaluatorUtils.java:1775)\r\n\tat sl.EvaluatorUtils.method(EvaluatorUtils.java:783)\r\n\tat SC$2.eval(Unknown Source)\r\n\tat sl.EvaluatorUtils.methodInternal(EvaluatorUtils.java:860)\r\n\tat sl.EvaluatorUtils.method(EvaluatorUtils.java:780)\r\n\tat SC$1.eval(Unknown Source)\r\n\tat sl.EvaluatorUtils.methodInternal(EvaluatorUtils.java:860)\r\n\tat sl.EvaluatorUtils.method(EvaluatorUtils.java:780)\r\n\tat sl.EvaluatorUtils.method(EvaluatorUtils.java:772)\r\n\tat SC.evaluate(Unknown Source)\r\n\tat com.snaplogic.util.ExpressionUtils$MyExpressionProperty.eval(ExpressionUtils.java:281)\r\n\tat com.snaplogic.snap.api.impl.PropertyValuesImpl$ValidatingExpressionProperty.eval(PropertyValuesImpl.java:1005)\r\n\tat com.snaplogic.snaps.transform.DataTransform.processBinary(DataTransform.java:263)\r\n\tat com.snaplogic.snaps.transform.DataTransform.process(DataTransform.java:216)\r\n\tat com.snaplogic.snap.api.ExecutionUtil.process(ExecutionUtil.java:106)\r\n\tat com.snaplogic.snap.api.ExecutionUtil.execute(ExecutionUtil.java:70)\r\n\tat com.snaplogic.snap.api.SimpleSnap.execute(SimpleSnap.java:70)\r\n\tat com.snaplogic.cc.snap.common.SnapRunnableImpl.executeSnap(SnapRunnableImpl.java:800)\r\n\tat com.snaplogic.cc.snap.common.SnapRunnableImpl.executeForSuggest(SnapRunnableImpl.java:647)\r\n\tat com.snaplogic.cc.snap.common.SnapRunnableImpl.doRun(SnapRunnableImpl.java:856)\r\n\tat com.snaplogic.cc.snap.common.SnapRunnableImpl.call(SnapRunnableImpl.java:435)\r\n\tat com.snaplogic.cc.snap.common.SnapRunnableImpl.call(SnapRunnableImpl.java:117)\r\n\tat java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)\r\n\tat java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)\r\n\tat java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)\r\n\tat java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)\r\n\tat java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)\r\n\tat java.base/java.lang.Thread.run(Thread.java:834)\r\n"

[j_angelevski]

Hi @Henchway,

Can you share your expression for this error ?

[koryknick · Accepted solution]

Change your responsibleUnit to a function:

	"responsibleUnit": (opt) => match opt {
	   "10" => "Delivery",
	   "9" => "Operation",
	   "8" => this.salesRegionMapper('accountableUnit', 8),
	   "16" => "Tolling Services",
       _ => "unknown"
	   },

Then you can call as a function and it will drilldown to the salesRegionMapper function:
lib.testcall.responsibleUnit('8')