String concatenation options in Root-Level Logger Middleware

string concatenating using console.log(req.method + " " + req.path + " - " + req.ip) passes but not console.log("%s %s - %s", req.method, req.path, req.ip)
does anyone know why?

app.use(function(req, res, next){
console.log("%s %s - %s", req.method, req.path, req.ip);

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Challenge: Implement a Root-Level Request Logger Middleware

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