Type assertion - Go programming language tutorial (25)
By using type assertion, we can retrieve the underlying value of an interface variable. An interfaces might contain different underlying types. We want to access specific methods or properties of those types.We use comma-ok idiom to assert a data type to avoid panic. If the assertion is allowed, the second value becomes true and the first variable stores the asserted value. If the assertion fails, the second value becomes false and the first variable stores the default value. We can use type switch to switch on the type of an interface value. If we use type switches in functions, then a function containing a type switch can handle different types dynamically. Type assertion can also be achieved on custom types.
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