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https://github.com/golang/go
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e24977d231
The next CL will remove the -G flag, effectively hard-coding it to its current default (-G=3). Change-Id: Ib4743b529206928f9f1cca9fdb19989728327831 Reviewed-on: https://go-review.googlesource.com/c/go/+/388534 Reviewed-by: Keith Randall <khr@golang.org> Trust: Matthew Dempsky <mdempsky@google.com> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
40 lines
885 B
Go
40 lines
885 B
Go
// run
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// Copyright 2021 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"fmt"
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"reflect"
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"strconv"
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)
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// Map calls the function f on every element of the slice s,
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// returning a new slice of the results.
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func mapper[F, T any](s []F, f func(F) T) []T {
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r := make([]T, len(s))
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for i, v := range s {
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r[i] = f(v)
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}
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return r
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}
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func main() {
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got := mapper([]int{1, 2, 3}, strconv.Itoa)
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want := []string{"1", "2", "3"}
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if !reflect.DeepEqual(got, want) {
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panic(fmt.Sprintf("got %s, want %s", got, want))
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}
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fgot := mapper([]float64{2.5, 2.3, 3.5}, func(f float64) string {
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return strconv.FormatFloat(f, 'f', -1, 64)
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})
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fwant := []string{"2.5", "2.3", "3.5"}
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if !reflect.DeepEqual(fgot, fwant) {
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panic(fmt.Sprintf("got %s, want %s", fgot, fwant))
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}
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}
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