Uncaught Type Error : operation.match is not a function

I am trying to get a user Input and turn that into an array of string to my token. For some reason it is not working.

For example …Compute(5*6+7) should give token = ["5","**","6","+","7"]

function splitOperation(operation) {
return operation.match(/(\d+(\.\d+)?|[+\-*/])/g);
}
  

function Compute(userInput) {
    let token = [splitOperation(userInput)];
    
    }
    
let userInput = 5*6+7
Compute(userInput)

>Solution :

5*6+7 is a number.

To use "match" you need a string, use "5*6+7", if your regex is good, this should do it.