resize!

resize!(collection, n) -> collection

Resize `collection` to contain `n` elements. If `n` is smaller than the current collection length, the first `n` elements will be retained. If `n` is larger, the new elements are not guaranteed to be initialized.

``````julia> resize!([6, 5, 4, 3, 2, 1], 3)
3-element Array{Int64,1}:
6
5
4``````
``````julia> resize!([6, 5, 4, 3, 2, 1], 8)
8-element Array{Int64,1}:
6
5
4
3
2
1
0
0``````

Examples

In the Julia programming language, the function resize!(collection, n)

Resize `collection` to contain `n` elements. If `n` is smaller than the current collection length, the first `n` elements will be retained. If `n` is larger, the new elements are not guaranteed to be initialized.

``````julia> resize!([6, 5, 4, 3, 2, 1], 3)
3-element Array{Int64,1}:
6
5
4``````
``````julia> resize!([6, 5, 4, 3, 2, 1], 8)
8-element Array{Int64,1}:
6
5
4
3
2
1
0
0``````
1. Resize an array to a smaller size:

``````julia> arr = [10, 20, 30, 40, 50];
julia> resize!(arr, 3)
3-element Array{Int64,1}:
10
20
30``````

This example resizes the array `arr` to contain only 3 elements. The first 3 elements are retained, and the extra elements are removed.

2. Resize an array to a larger size:
``````julia> arr = [6, 5, 4, 3, 2, 1];
julia> resize!(arr, 8)
8-element Array{Int64,1}:
6
5
4
3
2
1
0
0``````

It resizes the array `arr` to contain 8 elements. If the new size is larger than the original size, the new elements are not guaranteed to be initialized.

Common mistake example:

``````julia> arr = [1, 2, 3, 4, 5];
julia> resize!(arr, 10)
ERROR: MethodError: no method matching resize!(::Array{Int64,1}, ::Int64)``````

In this example, the function `resize!` is called with an unsupported type. Ensure that the collection passed to `resize!` is of a mutable type that supports resizing.