英文:
How to interpolate a byte slice?
问题
我正在尝试构建一个用于POST请求的JSON负载：
var payload = []byte(`{"foo":"bar", "hello":"world"}`)
然而，我希望值能够从现有字符串中插值。我尝试使用%s，但这显然不是语法正确的：
var payload = []byte(`{"foo":%s, "hello":%s}`, val1, val2)
感觉我完全走错了方向。任何建议都将不胜感激。谢谢。
英文:
I'm attempting to build a JSON payload for a POST request:
var payload = []byte(`{"foo":"bar", "hello":"world"}`)
However, I would like the values to be interpolated from an existing string. I've tried to use %s, but this is obviously not syntactically correct:
var payload = []byte(`{"foo":%s, "hello":%s}`, val1, val2)
Feels like I'm going about this the entirely wrong way. Any suggestions would be appreciated. Thanks.
答案1
得分: 5
要使用%s，你需要一个格式化函数。
var payload = []byte(fmt.Sprintf(`{"foo":%q, "hello":%q}`, val1, val2))
（%q类似于%s，但会为你添加引号）
英文:
To use %s, you need a formatting function.
var payload = []byte(fmt.Sprintf(`{"foo":%q, "hello":%q}`, val1, val2))
(%q is like %s but adds quotes for you)
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