CODEWITHSUNDEEP
julia
cybervigilante
cybervigilante

Reputation: 261

Is there a "next" type of function in Julia, as in Python?

Is there something comparable to Python's "next" for going through a Julia iterable? I can't seem to find anything in the documentation.

Upvotes: 3

Views: 1117

Answers (2)

t-bltg
t-bltg

Reputation: 904

Here is the closest you can achieve, using Stateful from Base.Iterators module:

Julia

julia> it = Iterators.Stateful((1, 2));
julia> popfirst!(it)
1
julia> popfirst!(it)
2
julia> popfirst!(it)
ERROR: EOFError: read end of file
Stacktrace:
 [1] popfirst!(s::Base.Iterators.Stateful{Tuple{Int64, Int64}, Any})
   @ Base.Iterators ./iterators.jl:1355
 [2] top-level scope
   @ REPL[5]:1

Python

>>> it = iter((1, 2))
>>> next(it)
1
>>> next(it)
2
>>> next(it)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
StopIteration

Upvotes: 2

Peter Stenger
Peter Stenger

Reputation: 175

https://docs.julialang.org/en/v1/base/collections/

next = iterate(iter)
(i, state) = next

Alternatively, it appears peek will get the first element, but won't iterate.

Upvotes: 2

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