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Problem: You want to create streaming JSON data from structs. Solution: Create an encoder using NewEncoder in the encoding/json package, passing it an
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posted @ 2023-10-03 11:51
ZhangZhihuiAAA
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Problem: You want to create JSON data from a struct. Solution: Create the structs then use the json.Marshal or json.MarshalIndent to marshal the data
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posted @ 2023-10-03 11:42
ZhangZhihuiAAA
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Problem: You want to parse JSON data from a stream. Solution: Create structs to contain the JSON data. Create a decoder using NewDecoder in the encodi
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posted @ 2023-10-03 11:23
ZhangZhihuiAAA
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Using io.Copy is about twice as fast and uses only a fraction (less than 1%) of the memory. With really large files, if you’re using the io.ReadAll an
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posted @ 2023-10-01 20:20
ZhangZhihuiAAA
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package main import "fmt" func adder() func(int) int { sum := 0 return func(x int) int { sum += x return sum } } func main() { pos, neg := adder(), ad
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posted @ 2023-09-30 10:14
ZhangZhihuiAAA
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Problem: You want to log in to the system log instead of your logfiles. Solution: Use the log/syslog package to write to syslog. Syslog is a standard
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posted @ 2023-09-30 08:20
ZhangZhihuiAAA
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Examples of log levels from high to low are: • Fatal • Error• Warn • Info • Debug To set up log levels for your logs, you can add the level to each li
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posted @ 2023-09-29 17:55
ZhangZhihuiAAA
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Problem: You want to log events to a logfile instead of standard error. Solution: Use the SetOutput function to set the log to write to a file. You us
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posted @ 2023-09-29 15:15
ZhangZhihuiAAA
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Problem: You want to check for specific errors or specific types of errors. Solution: Use the errors.Is and errors.As functions. The errors.Is functio
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posted @ 2023-09-29 14:24
ZhangZhihuiAAA
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Problem: You want to provide additional information and context to an error you receive before returning it as another error. Solution: Wrap the error
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posted @ 2023-09-29 10:24
ZhangZhihuiAAA
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