Commit 94439492 authored by Andrew Gerrand's avatar Andrew Gerrand

doc: add Slices: usage and internals article

Originally published on the Go blog on 5 Jan 2011:
http://blog.golang.org/2011/01/go-slices-usage-and-internals.html

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/5516046
parent c2ea4122
......@@ -11,6 +11,7 @@ GOFILES=\
HTML=\
articles/defer_panic_recover.html\
articles/error_handling.html\
articles/slices_usage_and_internals.html\
effective_go.html\
go1.html\
go_tutorial.html\
......
This diff is collapsed.
This diff is collapsed.
......@@ -61,6 +61,7 @@ for i in \
$effective_go \
$error_handling \
$go_tutorial \
slices.go \
go1.go \
; do
$GC $i
......
package main
import (
"io/ioutil"
"regexp"
)
func AppendByte(slice []byte, data ...byte) []byte {
m := len(slice)
n := m + len(data)
if n > cap(slice) { // if necessary, reallocate
// allocate double what's needed, for future growth.
newSlice := make([]byte, (n+1)*2)
copy(newSlice, slice)
slice = newSlice
}
slice = slice[0:n]
copy(slice[m:n], data)
return slice
}
// STOP OMIT
// Filter returns a new slice holding only
// the elements of s that satisfy f()
func Filter(s []int, fn func(int) bool) []int {
var p []int // == nil
for _, i := range s {
if fn(i) {
p = append(p, i)
}
}
return p
}
// STOP OMIT
var digitRegexp = regexp.MustCompile("[0-9]+")
func FindDigits(filename string) []byte {
b, _ := ioutil.ReadFile(filename)
return digitRegexp.Find(b)
}
// STOP OMIT
func CopyDigits(filename string) []byte {
b, _ := ioutil.ReadFile(filename)
b = digitRegexp.Find(b)
c := make([]byte, len(b))
copy(c, b)
return c
}
// STOP OMIT
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment