bondscell_results$88e4de2b-a04d-486c-8377-dd9646eaaf90queued¤logsrunning¦outputbodydo-block syntax
If a function accepts another function as its first argument we can use the do-block syntax, it is particularly useful
Passing functions as arguments
It is not rare to pass a function as argument for another function, e.g. having to perform a fit. Julia gives the user 2 methods so that it can bypass the definition of the function.
Broadcasting
Suppose you have a function like the following
Unlike python, where the operator * applied to matrices performs an element wise multiplication, in Julia performs the row-column multiplication, we can still do the elementwise multiplication using broadcasting.
Anonymous functions
These are similar to python's lambda function, they are particularly useful for small functions.
Now imagine that you want to apply the function to all the element of an array. To pass the array as input would give an error
julia> add2([1, 2, 3])
ERROR: MethodError: no method matching add2(::Vector{Int64})
The function `add2` exists, but no method is defined for this combination of argument types.
Closest candidates are:
add2(::Number)
@ Main REPL[4]:1
We can then use the broadcasting operator . which applies the function to each element of the collection
if the functiona accepts only 1 argument, the brackets can be omitted, for functions with no arguments the syntax is ()->