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README.md |
README.md
You pass butter
Return values
We are now going to see how to declare a function that returns a value.
Let's say we declare the variable ten
the following way.
let ten = 5 + 5
console.log(ten) // 10
We could replace those 5
with a function that returns
this value. Let's call
this function returnsFive
. The only new concept is the return
keyword. It
returns the specified value and stop the function execution.
let returnsFive = () => {
return 5
// ↖ the keyword `return`, returns the value right after it,
// in this case the number 5.
}
Now that the function is declared, we call it where we need it.
let ten = returnsFive() + returnsFive()
console.log(ten) // 10
Now a question that you might ask yourself is: What if we had several return
keywords in the same function ? Well as mentioned before, the return
also
stops the function execution. So only the first return
would matter. In fact
that means that anything after the return
would not be executed. Example:
let returnsFive = () => {
return 5 // ONLY this return is executed. Everything else is ignored.
return 10 // not executed (useless)
return 'I am useless' // not executed either
console.log('I am also useless') // nor this one
}
let ten = returnsFive() + returnsFive()
console.log(ten) // 10
//exactly the same result as the previous example
As you may see, we get exactly the same result as the previous example.
returnsFive
only returns 5
. :)
Instructions
As Rick's robot, you now know your purpose. (Remember ? 'You pass butter.'
)
Define the function passButter
that returns the string 'The butter'
.