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Check if Array is Empty in Julia

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To check if an array is empty in Julia, you can use the isempty function. This function takes an array as its argument and returns true if the array is empty, and false otherwise. Here is an example:

Check if Array is Empty in Julia

julia> a = []
0-element Array{Any,1}

julia> isempty(a)
true

julia> b = [1, 2, 3]
3-element Array{Int64,1}:
 1
 2
 3

julia> isempty(b)
false

In the first example, we create an empty array a using the square bracket syntax. We then use the isempty function to check if the array is empty. Since the array does not contain any elements, the isempty function returns true.

In the second example, we create a non-empty array b containing three elements. When we apply the isempty function to this array, it returns false because the array is not empty.

Overall, the isempty function is a simple and effective way to check if an array is empty in Julia. It is a useful tool for working with arrays in your code.

Here is an advanced example that demonstrates some additional features of the isempty function:

julia> a = []
0-element Array{Any,1}

julia> # Check if array is empty or contains only missing values
julia> isempty(a) || all(ismissing, a)
true

julia> b = [1, 2, missing]
3-element Array{Union{Missing, Int64},1}:
 1
 2
  missing

julia> # Check if array is empty or contains only missing values
julia> isempty(b) || all(ismissing, b)
true

julia> c = [1, 2, 3]
3-element Array{Int64,1}:
 1
 2
 3

julia> # Check if array is empty or contains only missing values
julia> isempty(c) || all(ismissing, c)
false

In this example, we use the isempty function in combination with the all function and the ismissing function to check if an array is empty or contains only missing values.

We first create an empty array a and a non-empty array b that contains missing values. When we apply the isempty function to these arrays, it returns true because they are either empty or contain only missing values.

Next, we create a non-empty array c that does not contain any missing values. When we apply the isempty function to this array, it returns false because the array is not empty and does not contain only missing values.

This example shows how the isempty function can be used in combination with other functions to check for more complex conditions in arrays. It can be a useful tool for working with arrays in Julia.

Related:

  1. How to Create Array in Julia?
  2. Check if an Element is in Array in Julia
  3. Check if all Elements in Array are Equal in Julia