Golang Notes: Difference between revisions
From Federal Burro of Information
Jump to navigationJump to search
(Created page with "== Questions == import prefixes what ar ethye: * nothing * "." * "_" == Grab bag == === Environment Variables === https://stackoverflow.com/questions/40326540/how-to-ass...") |
No edit summary |
||
| Line 31: | Line 31: | ||
} | } | ||
</pre> | </pre> | ||
=== runtime.NumCPU === | |||
numcpu.go | |||
<pre> | |||
package main | |||
import ( | |||
"fmt" | |||
"runtime" | |||
) | |||
func main() { | |||
fmt.Println(runtime.NumCPU()) | |||
} | |||
</pre> | |||
go run numcpu.go | |||
Revision as of 20:54, 30 July 2020
Questions
import prefixes what ar ethye:
- nothing
- "."
- "_"
Grab bag
Environment Variables
https://stackoverflow.com/questions/40326540/how-to-assign-default-value-if-env-var-is-empty
func getenv(key, fallback string) string {
value := os.Getenv(key)
if len(value) == 0 {
return fallback
}
return value
}
func getEnv(key, fallback string) string {
if value, ok := os.LookupEnv(key); ok {
return value
}
return fallback
}
runtime.NumCPU
numcpu.go
package main
import (
"fmt"
"runtime"
)
func main() {
fmt.Println(runtime.NumCPU())
}
go run numcpu.go
