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will raise a run-time error if the value is not of the expected type,
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potentially catching certain bugs earlier.
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Declare types of named arguments
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Declare types of keyword arguments
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Named arguments can have declared types::
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Keyword arguments can have declared types::
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function with_named(x; name::Int = 1)
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function with_keyword(x; name::Int = 1)
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Functions are specialized on the types of named arguments, so these
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Functions are specialized on the types of keyword arguments, so these
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declarations will not affect performance of code inside the function.
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However, they will reduce the overhead of calls to the function that
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include named arguments.
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include keyword arguments.
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Functions with named arguments have near-zero overhead for call sites
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Functions with keyword arguments have near-zero overhead for call sites
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that pass only positional arguments.
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Passing dynamic lists of named arguments, as in ``f(x; names...)``,
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Passing dynamic lists of keyword arguments, as in ``f(x; keywords...)``,
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can be slow and should be avoided in performance-sensitive code.
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Break functions into multiple definitions
added
removed
doc/manual/performance-tips.rst
