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Currying
Function currying turns a function with multiple arguments into successive functions that each accept one argument.
For example, we can supply a shirt's unit price now and the quantity later:
func main() {
shirtCost := curriedCost(20)
fmt.Println(shirtCost(3))
// prints 60
fmt.Println(shirtCost(5))
// prints 100
}
func cost(unitPrice, quantity int) int {
return unitPrice * quantity
}
func curriedCost(unitPrice int) func(int) int {
return func(quantity int) int {
return cost(unitPrice, quantity)
}
}
curriedCost(20) returns a closure that remembers the unit price and waits for a quantity. Calling shirtCost(3) supplies that quantity and calls cost(20, 3).
You can also call the returned function immediately:
cost(20, 3) // returns 60
curriedCost(20)(3) // returns 60
Assignment
Textio needs loggers that remember which server an error came from.
Complete the getLogger function. It accepts a server label (a string).