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https://github.com/golang/go
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33 lines
688 B
Go
33 lines
688 B
Go
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// run
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// Copyright 2023 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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"maps"
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)
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func main() {
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m := map[string]struct{}{}
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// Fill m up to the max for 4 buckets = 48 entries.
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for i := 0; i < 48; i++ {
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m[fmt.Sprintf("%d", i)] = struct{}{}
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}
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// Add a 49th entry, to start a grow to 8 buckets.
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m["foo"] = struct{}{}
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// Remove that 49th entry. m is still growing to 8 buckets,
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// but a clone of m will only have 4 buckets because it
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// only needs to fit 48 entries.
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delete(m, "foo")
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// Clone an 8-bucket map to a 4-bucket map.
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_ = maps.Clone(m)
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}
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