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length(::AbstractArray)

length(A) -> Integer

Returns the number of elements in A.

Examples

julia> length("Test")-1
3

julia> a = [1,2,3]
       length(a)
3

1. Get the length of an array:

   julia> arr = [1, 2, 3, 4, 5];
   julia> length(arr)
   5

   This example returns the length of the array arr, which is 5.

2. Determine the length of a string:

   julia> str = "Hello, World!";
   julia> length(str)
   13

   It calculates the length of the string str, which is 13 characters.

3. Check the length of a dictionary:

   julia> dict = Dict("apple" => 1, "banana" => 2, "orange" => 3);
   julia> length(dict)
   3

   It returns the number of key-value pairs in the dictionary dict, which is 3.

Common mistake example:

julia> num = 12345;
julia> length(num)
ERROR: MethodError: no method matching length(::Int64)

In this example, the length() function is applied to a single number, which is not an ordered, indexable collection. It's important to understand that length() is used for collections and not individual elements.

See Also

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