The go-github.com.mailru.easyjson.jlexer package provides a flexible and efficient way of parsing JSON data. One of its functions is Lexer IsNull which determines whether a JSON object or a value is null.
Example 1:
data := `{ "name": "John", "age": null }` lexer := jlexer.Lexer{Data: []byte(data)} lexer.NextToken() if lexer.IsNull() { fmt.Println("Age is not available.") } else { var age int age = lexer.Int() fmt.Println("Age is:", age) }
In this example, we have a JSON object with a null value for the "age" field. The lexer is used to tokenize the JSON data and advance to the next token. The IsNull function returns true if the value is null, and false otherwise. If the value is null, we print a message stating that the age is not available. If the value is not null, we parse it as an integer using the Int function.
Example 2:
data := `null` lexer := jlexer.Lexer{Data: []byte(data)} if lexer.IsNull() { fmt.Println("The value is null.") } else { fmt.Println("The value is not null.") }
In this example, we have a simple JSON value of null. The lexer is used to tokenize the data and check if it is null using the IsNull function. The function returns true since the value is indeed null. We print a message stating that the value is null.
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