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How to customize a string by variable in Javascript?

I want to print an errormessage using javascript in certain cases. The string is german and the start depends on a variable called blfType which can be "field", "line" or "block" and the string then would be "This field already has this prerequisite" if blfType is field. I tried to do that similiar as I would do it in python:

alert("Das Feld"*(blfType == 'field') + "Die Zeile"*(blfType == 'line') + "Der Block"*(blfType == 'block')+" besitzt diese Vorraussetzung bereits");

But this would just print "NaN besitzt diese Vorraussetzung bereits". Is there any other way how I can do this in just one line or do I have to do create another Variable that takes the start of the sentence.

In this case I would do this in python like that:

const gerblfType = "Feld" if blfType === "field" else "Zeile" if blfType === "line" else "Block"

But this is also not working. Is there a smooth way in Javascript to not do it like that:

gerblfType = "Feld";
if(blfType == "line") gerblfType = "Zeile";
if(blfType == "block") gerblfType = "Block";
Via Active questions tagged javascript - Stack Overflow https://ift.tt/2FdjaAW
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