isinteger

isinteger(x) -> Bool

Test whether `x` or all its elements are numerically equal to some integer

Examples

1. Check if a single value is an integer:

``````julia> x = 5;
julia> isinteger(x)
true``````

This example checks if the value of `x` is an integer.

2. Check if all elements of an array are integers:

``````julia> arr = [1, 2, 3, 4];
julia> isinteger(arr)
true``````

It checks if all elements in the array `arr` are integers.

3. Handle non-integer values:

``````julia> y = 3.14;
julia> isinteger(y)
false``````

In this example, `isinteger` returns `false` because `y` is not an integer.

4. Check if elements of a matrix are integers:
``````julia> matrix = [1 2; 3 4];
julia> isinteger(matrix)
true``````

This example checks if all elements in the matrix are integers.

Common mistake example:

``````julia> z = "10";
julia> isinteger(z)
ERROR: MethodError: no method matching isinteger(::String)``````

In this example, the `isinteger` function cannot be applied to a string. It can only be used with numerical types. Make sure to provide valid numeric inputs to `isinteger` to avoid such errors.