mirror of
https://github.com/teivah/100-go-mistakes.git
synced 2026-06-24 02:16:55 +08:00
52 lines
878 B
Go
52 lines
878 B
Go
package main
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import "sync"
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type Cache struct {
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mu sync.Mutex
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balances map[string]float64
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}
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func (c *Cache) AddBalance(id string, balance float64) {
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c.mu.Lock()
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c.balances[id] = balance
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c.mu.Unlock()
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}
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func (c *Cache) AverageBalance1() float64 {
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c.mu.Lock()
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balances := c.balances
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c.mu.Unlock()
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sum := 0.
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for _, balance := range balances {
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sum += balance
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}
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return sum / float64(len(balances))
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}
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func (c *Cache) AverageBalance2() float64 {
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c.mu.Lock()
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defer c.mu.Unlock()
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sum := 0.
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for _, balance := range c.balances {
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sum += balance
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}
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return sum / float64(len(c.balances))
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}
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func (c *Cache) AverageBalance3() float64 {
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c.mu.Lock()
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m := make(map[string]float64, len(c.balances))
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for k, v := range c.balances {
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m[k] = v
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}
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c.mu.Unlock()
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sum := 0.
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for _, balance := range m {
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sum += balance
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}
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return sum / float64(len(c.balances))
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}
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