diff options
Diffstat (limited to 'go.html.markdown')
| -rw-r--r-- | go.html.markdown | 27 |
1 files changed, 14 insertions, 13 deletions
diff --git a/go.html.markdown b/go.html.markdown index f097caeb..ae99535b 100644 --- a/go.html.markdown +++ b/go.html.markdown @@ -15,15 +15,15 @@ contributors: --- Go was created out of the need to get work done. It's not the latest trend -in computer science, but it is the newest fastest way to solve real-world +in programming language theory, but it is a way to solve real-world problems. -It has familiar concepts of imperative languages with static typing. +It draws concepts from imperative languages with static typing. It's fast to compile and fast to execute, it adds easy-to-understand -concurrency to leverage today's multi-core CPUs, and has features to -help with large-scale programming. +concurrency because multi-core CPUs are now common, and it's used successfully +in large codebases (~100 million loc at Google, Inc.). -Go comes with a great standard library and an enthusiastic community. +Go comes with a good standard library and a sizeable community. ```go // Single line comment @@ -48,7 +48,7 @@ import ( // executable program. Love it or hate it, Go uses brace brackets. func main() { // Println outputs a line to stdout. - // Qualify it with the package name, fmt. + // It comes from the package fmt. fmt.Println("Hello world!") // Call another function within this package. @@ -99,12 +99,12 @@ can include line breaks.` // Same string type. // Arrays have size fixed at compile time. var a4 [4]int // An array of 4 ints, initialized to all 0. - a3 := [...]int{3, 1, 5} // An array initialized with a fixed size of three - // elements, with values 3, 1, and 5. + a5 := [...]int{3, 1, 5, 10, 100} // An array initialized with a fixed size of five + // elements, with values 3, 1, 5, 10, and 100. // Slices have dynamic size. Arrays and slices each have advantages // but use cases for slices are much more common. - s3 := []int{4, 5, 9} // Compare to a3. No ellipsis here. + s3 := []int{4, 5, 9} // Compare to a5. No ellipsis here. s4 := make([]int, 4) // Allocates slice of 4 ints, initialized to all 0. var d2 [][]float64 // Declaration only, nothing allocated here. bs := []byte("a slice") // Type conversion syntax. @@ -134,7 +134,7 @@ can include line breaks.` // Same string type. // Unused variables are an error in Go. // The underscore lets you "use" a variable but discard its value. - _, _, _, _, _, _, _, _, _, _ = str, s2, g, f, u, pi, n, a3, s4, bs + _, _, _, _, _, _, _, _, _, _ = str, s2, g, f, u, pi, n, a5, s4, bs // Usually you use it to ignore one of the return values of a function // For example, in a quick and dirty script you might ignore the // error value returned from os.Create, and expect that the file @@ -180,7 +180,7 @@ func learnFlowControl() { if true { fmt.Println("told ya") } - // Formatting is standardized by the command line command "go fmt." + // Formatting is standardized by the command line command "go fmt". if false { // Pout. } else { @@ -277,7 +277,8 @@ func sentenceFactory(mystring string) func(before, after string) string { } func learnDefer() (ok bool) { - // Deferred statements are executed just before the function returns. + // A defer statement pushes a function call onto a list. The list of saved + // calls is executed AFTER the surrounding function returns. defer fmt.Println("deferred statements execute in reverse (LIFO) order.") defer fmt.Println("\nThis line is being printed first because") // Defer is commonly used to close a file, so the function closing the @@ -295,7 +296,7 @@ type pair struct { x, y int } -// Define a method on type pair. Pair now implements Stringer. +// Define a method on type pair. Pair now implements Stringer because Pair has defined all the methods in the interface. func (p pair) String() string { // p is called the "receiver" // Sprintf is another public function in package fmt. // Dot syntax references fields of p. |