CODEWITHSUNDEEP
julia
Streamfighter
Streamfighter

Reputation: 452

Pop! multiple items from Julia vector

In the same way as push!(collection, items...) -> collection allows to add multiple items in one operation I want to pop! n items at once. I am looking for this behavior

function popMany!(vector, n)
    result = vector[1:n]
    deleteat!(vector, 1:n)
    return result
end

I found the related issue, but in contrast to the push! variations, pop!(collection, n) was never implemented.

Also popat!.(1:9,1:3) throws DimensionMismatch. popfirst! does not support additional arguments.

Is there already a function to pop multiple / many / a range of / indexed items?

Upvotes: 1

Views: 1117

Answers (2)

Kristoffer Carlsson
Kristoffer Carlsson

Reputation: 2838

Is there already a function to pop multiple / many / a range of / indexed items?

splice!?

Upvotes: 4

Jack Shannon
Jack Shannon

Reputation: 216

I'm not aware of a built-in function that does this automatically, but you can write a short one-liner using a comprehension:

julia> pop_many!(x, n) = [pop!(x) for _ in 1:n]
pop_many! (generic function with 1 method)

julia> x = rand(5)
5-element Array{Float64,1}:
 0.14855795213861422
 0.18593252832228968
 0.3353192149050159
 0.4537045868321117
 0.3912440300789175

julia> pop_many!(x, 3)
3-element Array{Float64,1}:
 0.3912440300789175
 0.4537045868321117
 0.3353192149050159

julia> x
2-element Array{Float64,1}:
 0.14855795213861422
 0.18593252832228968

Upvotes: 4

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