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@mdwhatcott

mdwhatcott/get_or_set_default.go

Created October 26, 2022 04:48
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Like Java's 'computeIfAbsent'...
Raw
get_or_set_default.go
func GetOrSetDefault[K comparable, V any](m map[K]V, key K, new_ func() V) V {
value, found := m[key]
if !found {
value = new_()
m[key] = value
}
return value
}
/*
a := make(map[int]string)
GetOrSetDefault(a, 42, func() string { return "hi" })
fmt.Println(a[42]) // hi
*/
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