collection function _ golang
We often need our programs to perform operations on collection of data, like selecting all items that satisfy a given predicate or mapping all items to a new collection with a custom function.
package main import ( "fmt" "strings" ) func Index(vs []string, t string) int { for i, v := range vs { if v == t { return i } } return -1 } func Include(vs []string, t string) bool { return Index(vs, t) >= 0 } func Any(vs []string, f func(string) bool) bool { for _, v := range vs { if f(v) { return true } } return false } func All(vs []string, f func(string) bool) bool { for _, v := range vs { if !f(v) { return false } } return true } func Filter(vs []string, f func(string) bool) []string { vsf := make([]string, 0) for _, v := range vs { if f(v) { vsf = append(vsf, v) } } return vsf } func Map(vs []string, f func(string) string) []string { vsm := make([]string, len(vs)) for i, v := range vs { vsm[i] = f(v) } return vsm } func main() { var strs = []string{"peach", "apple", "pear", "plum"} fmt.Println(Index(strs, "pear")) fmt.Println(Include(strs, "grape")) fmt.Println(Any(strs, func(v string) bool { return strings.HasPrefix(v, "p") })) fmt.Println(All(strs, func(v string) bool { return strings.HasPrefix(v, "p") })) fmt.Println(Filter(strs, func(v string) bool { return strings.Contains(v, "e") })) fmt.Println(Map(strs, strings.ToUpper)) }
2 false true false [peach apple pear] [PEACH APPLE PEAR PLUM]
总结 :
1 : ...
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