passing function as an argument: The function can also be passed as an argument to other functions. In the following example, Function2 is declared with function argument. This function2 is called with supplying
Example 2: Passing a Function as an Argument You can pass a function as an argument to another function: </> Copy packagemainimport"fmt"// Define a function to be passedfuncadd(aint,bint)int{returna+b}// Define a higher-order functionfunccalculate(aint,bint,operationfunc(int,int)int)...
Given the function and calls funcGreeting(prefixstring, who ...string)Greeting("nobody") Greeting("hello:","Joe","Anna","Eileen") within Greeting, who will have the value nil in the first call, and []string{"Joe", "Anna", "Eileen"} in the second. If the final argument is assigna...
In these cases, we can use thecontext.WithCancelCauseinstead. This function returns a context object, and a function that takes an error as an argument. Let’s see the same example as before, but with theWithCancelCausefunction: funcoperation1(ctxcontext.Context)error{time.Sleep(100*time.Milli...
Println() // calling the function in the sort package by passing the stringSlice as an argument sort.Strings(stringSlice[:]) fmt.Println() fmt.Println("Elements after sorting in lexicographical order.") // printing the elements after sorting them in lexicographical order for i :...
within Greeting, who will have the same value as s with the same underlying array. 也就是说,如果我们传入的是slice...这种形式的参数,go不会创建新的slice。写了一个简单的例子验证: package main import "fmt" func t(args ...int) {
[x]}returns}// Calling the main functionfuncmain(){// defining an array of integers and storing values in itarr:=[]int{50,29,36,55,87,95}// calling then unexported method addition() to find the sum of the array and passing the// array to it as// an argument and storing the ...
Now that you're passing in an empty name, you'll get an error. 现在你传入一个空名字,你将得到一个错误。 $ go run . greetings: empty name exit status1 That's common error handling in Go: Return an error as a value so the caller can check for it. ...
// after the cancel function returns./// WithCancel arranges for Done to be closed when cancel is called;// WithDeadline arranges for Done to be closed when the deadline// expires; WithTimeout arranges for Done to be closed when the timeout// elapses./// Done is provided for use in...
The go vet command now diagnoses passing function or method values as arguments to Printf, such as when passing f where f() was intended. PerformanceAs always, the changes are so general and varied that precise statements about performance are difficult to make. Some programs may run faster, ...