Extract elements of NamedTuple

General Usage
1

Hi Julia users,

I was trying to extract multiple elements from a NamedTuple and Failed.

It works for extracting one element (pt here is a NamedTuple) through the following code line
pt[:cancer_type]

But doesn’t work for extracting multiple elements, see below
pt[:cancer_type, :time_to_cancer_dx]
or
pt[[:cancer_type, :time_to_cancer_dx]]

Any suggestions? Thanks a lot.

2 
obj = (a = 1, b = 2, c = 3)
a, b, c = obj.a, obj.b, obj.c
a, b, c = [ getproperty(obj, pn) for pn in propertynames(obj) ]

or using Parameters.jl

using Parameters
@unpack a, b, c = obj

Use three back-ticks (`) for formatting code in posts.

3

Or something like

julia> nt = (a = 1, b = 2, c = 3)
(a = 1, b = 2, c = 3)

julia> getproperty.(Ref(nt), [:a, :b])
2-element Array{Int64,1}:
 1
 2

but note that a NamedTuple may not be the best match for this use case (you don’t get the inference advantages when the field names are provided dynamically, you might as well just use a Dict or similar).