Vectors are one-dimensional arrays, and support mostly the same interface as their multi-dimensional counterparts. However, vectors also support additional operations.

First, note that `Vector{T}`

where `T`

is some type means the same as `Array{T,1}`

.

```
julia> Vector{Int}
Array{Int64,1}
julia> Vector{Float64}
Array{Float64,1}
```

One reads `Array{Int64,1}`

as "one-dimensional array of `Int64`

".

Unlike multi-dimensional arrays, vectors can be resized. Elements can be added or removed from the front or back of the vector. These operations are all constant amortized time.

```
julia> A = [1, 2, 3]
3-element Array{Int64,1}:
1
2
3
julia> push!(A, 4)
4-element Array{Int64,1}:
1
2
3
4
julia> A
4-element Array{Int64,1}:
1
2
3
4
julia> pop!(A)
4
julia> A
3-element Array{Int64,1}:
1
2
3
julia> unshift!(A, 0)
4-element Array{Int64,1}:
0
1
2
3
julia> A
4-element Array{Int64,1}:
0
1
2
3
julia> shift!(A)
0
julia> A
3-element Array{Int64,1}:
1
2
3
```

As is convention, each of these functions `push!`

, `pop!`

, `unshift!`

, and `shift!`

ends in an exclamation mark to indicate that they are mutate their argument. The functions `push!`

and `unshift!`

return the array, whereas `pop!`

and `shift!`

return the element removed.

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