ok thanks for the explanations ! have a nice day !

The line given by the error log doesn't match with the line in your actual code (I think the diplayed line is the one in the program after being reformatted by the interpreter, though I am not sure and I could not give you any more details). I just saw this comma at the start of the line, highlighted by syntax coloration...

Thank you ! i couldn't find the line 45 ?? how did you know it was in the last function?

There is a syntax error in your code (it's in the last function).

I got this error while testing :
/workspace/node/test.js:45
; //set number value to b
^
Does somebody know what this means please ?

i agree with you ! i'm using js as a beginner and can resolve katas but this one uses the string prototype and not function arguments and so beginners like me don't know how to adapt their answer ! thanks to try to understand us !😅