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JavaScript

Why don't we need to define 'response' when we talk about promises and you can just instantly pass it a function?

I'm watching Fetch API videos with Guil and I'm just trying to remember why he can do something like fetch('url') .then(response => response.json())

Why are you able to just type 'response' without defining it and pass it directly into a function with => ? Does the compiler just automatically know that response is a function and doesn't need to be defined because of the syntax of the code?

Also I just want to make sure I'm 100% across this but the value given from fetch('url') and then the .then() by chaining .then() you are directly passing the value from fetch() into .then() does this happen with other functions or just promises?