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s1034: Add explanatory example #1703

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22 changes: 22 additions & 0 deletions simple/s1034/s1034.go
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Expand Up @@ -24,6 +24,28 @@ var SCAnalyzer = lint.InitializeAnalyzer(&lint.Analyzer{
Doc: &lint.RawDocumentation{
Title: `Use result of type assertion to simplify cases`,
Since: "2019.2",
Text: `
When using the type of a variable in a switch statement, the type of the variable is inferred from the case condition.

The following

switch o.(type) {
case string:
a = o.(string)
case int:
b = o.(int)
}

can be simplified as

switch o.(type) {
case string:
a = o
case int:
b = o
}

as the type of o has been established within the context of the case statement.`,
MergeIf: lint.MergeIfAny,
},
})
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