valtype
valtype(type)
Get the value type of an associative collection type. Behaves similarly to eltype.
Examples
In the Julia programming language, the function valtype(type) is used to get the value type of an associative collection type. It behaves similarly to the eltype function.
julia> valtype(Dict{String, Int})
Int64
julia> valtype(StructArray{String, Int})
Int64Common examples of its use:
-
Get the value type of a Dictionary:
julia> valtype(Dict{String, Int}) Int64This example returns the value type (
Int64) of the dictionary typeDict{String, Int}. -
Get the value type of a StructArray:
julia> valtype(StructArray{String, Int}) Int64It returns the value type (
Int64) of theStructArray{String, Int}type. - Handle generic associative collection types:
julia> valtype(Dict{Any, Any}) AnyWhen working with generic associative collection types, such as
Dict{Any, Any}, the function returns the value type asAny.
Common mistake example:
julia> valtype([1, 2, 3])
ERROR: MethodError: no method matching valtype(::Array{Int64,1})In this example, the valtype function is applied to an array (Array{Int64,1}). However, valtype is specifically used for associative collection types like dictionaries and struct arrays, not regular arrays. Make sure to use valtype with associative collection types to avoid such errors.
See Also
BigFloat, BigInt, Dict, eltype, fieldtype, Float32, Float64, IntSet, isa, isalnum, isalpha, isascii, iseltype, isequal, isgraph, isimmutable, isinteractive, isleaftype, isnull, ispunct, isspace, issubtype, keytype, Nullable, NullException, promote_type, typeintersect, typejoin, typemax, typemin, typeof, Val, valtype,User Contributed Notes
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