Golang os.Exit() function is “used to immediately exits the program with a given status”. The Exit() function accepts a status code as an argument where code 0 suggests success and the non-zero code suggests an error.
Syntax
func Exit(code int)
Parameters
code: This parameter is the integer status code that will be returned to the operating system.
Return Value
The return type of the os.Exit() function nothing because it terminates the program.
Status codes
The status code 0 indicates an exit with no error and 1 with a general error. You can set the status code to whatever you want. Any other numerical value between 1 and 125 (golang) shows the program encountered an error.
Example 1: How to Use os.Exit() function
package main
import (
"fmt"
"os"
)
func main() {
fmt.Println("We are the world!")
os.Exit(0)
fmt.Println("We are the children")
}
Output
We are the world!
Example 2: Using defer with Exit()
package main
import (
"fmt"
"os"
)
func main() {
defer fmt.Println("Deferred function")
fmt.Println("Starting program")
os.Exit(3)
fmt.Println("This line will not be executed")
}
Output
exit status 3
In this example, the os.Exit() function is used to instantly exit the program with a status code 3.
The defer statement is used to defer the execution of the fmt.Println(“Deferred function”) statement until the surrounding function has been completed.
However, since os.Exit() terminates the program immediately; the deferred function is not executed.
That’s it.
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Krunal Lathiya is a seasoned Computer Science expert with over eight years in the tech industry. He boasts deep knowledge in Data Science and Machine Learning. Versed in Python, JavaScript, PHP, R, and Golang. Skilled in frameworks like Angular and React and platforms such as Node.js. His expertise spans both front-end and back-end development. His proficiency in the Python language stands as a testament to his versatility and commitment to the craft.