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Added a small section on type assertions.#152
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| Usually, this will happen when you know the type of a value is more specific than its current type. | ||
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| *Type assertions* are a way to tell the compiler "trust me, I know what I'm doing." | ||
| A type assertion is like a type cast in other languages, but where some languages might perform some special checking or restructuring of data, a type assertion has no runtime impact. |
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you mention "other languages" twice. I'd reword to "A type assertion is like a type cast in other languages, but performs no special checking or restructuring of data. It has no runtime impact at all -- it is information for the compiler only."
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DanielRosenwasser
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Feb 16, 2016
Added a small section on type assertions.
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I think this deserves a page by itself. |
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Fixes #123.
@sandersn @BrendanShah @bowdenk7