Broadcasts the arrays `As` to a common size by expanding singleton dimensions, and returns an array of the results `f(as...)` for each position.

## Examples

1. Broadcast a function over arrays:

``````julia> arr1 = [1, 2, 3];
julia> arr2 = [4, 5, 6];
3-element Array{Int64,1}:
5
7
9``````

This example broadcasts the addition function `+` over `arr1` and `arr2`, resulting in a new array where each element is the sum of the corresponding elements from `arr1` and `arr2`.

2. Broadcast a function over a scalar and an array:

``````julia> scalar = 10;
julia> arr = [1, 2, 3];
3-element Array{Int64,1}:
10
20
30``````

Here, the multiplication function `*` is applied element-wise between the scalar value `scalar` and each element of the array `arr`.

3. Broadcast a function over multiple arrays:
``````julia> arr1 = [1, 2, 3];
julia> arr2 = [4, 5, 6];
julia> arr3 = [7, 8, 9];
3-element Array{Int64,1}:
-10
-11
-12``````

This example broadcasts the subtraction function `-` over `arr1`, `arr2`, and `arr3`, resulting in a new array where each element is the difference of the corresponding elements from the three arrays.

Common mistake example:

``````julia> arr1 = [1, 2, 3];
julia> arr2 = [4, 5];
ERROR: DimensionMismatch("arrays could not be broadcast to a common size")``````

In this example, the arrays `arr1` and `arr2` are not compatible for broadcasting because their sizes do not match. It's important to ensure that the arrays being broadcasted have compatible dimensions to avoid such errors.