A.ord_size

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Link to this macro

ord_size(ord_map)

View Source (macro)

Returns the size of an ord_map.

It is implemented as a macro so that it can be used in guards.

When used outside of a guard, it will just be replaced by a call to A.OrdMap.size/1.

When used in guards, it will fail if called on something else than an A.OrdMap. It is recommended to verify the type first.

Runs in constant time.

Examples

iex> import A
iex> ord_map = A.OrdMap.new(a: 1, b: 2, c: 3)
iex> match?(v when ord_size(v) > 5, ord_map)
false
iex> match?(v when ord_size(v) < 5, ord_map)
true
iex> ord_size(ord_map)
3