golang中逗号

写golang的时候总是疑惑什么时候需要加逗号，在此总结一下
1、 json格式

const jsonStream = 
[
	{"Name": "Ed", "Text": "Knock knock."},
	{"Name": "Sam", "Text": "Who's there?"},
	{"Name": "Ed", "Text": "Go fmt."},
	{"Name": "Sam", "Text": "Go fmt who?"},
	{"Name": "Ed", "Text": "Go fmt yourself!"}
]
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需要加逗号，但是注意最后一个entry不用加

2、结构体初始化

type struct_variable_type struct {
   member definition
   member definition
   ...
   member definition
}
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如果是写在一行中，需要加逗号，最后一个不加

variable_name := structure_variable_type {value1, value2...valuen}
或
variable_name := structure_variable_type { key1: value1, key2: value2..., keyn: valuen}
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如果是这种写法，则都要加逗号

variable_name := structure_variable_type { 
	key1: value1, 
	key2: value2,
	..., 
	keyn: valuen,
}
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每个都要加，包括最后一个