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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.

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