We have discussed be basic syntax of ChaiScript in the previous tutorial. Today, I’m going to talk about functions in ChaiScript.
Define a function in ChaiScript
We can define a function in ChaiScript. Here is how its done. The general syntax is
def func(x)
{
//function body here
}
It is just like how a function is defined any language(that is not functional). Just like it is
For example. A function that gives you the answer to the the answer to life the universe and everything can be written as
def getAnswerOfEverything()
{
return 42;
}
Returning value from a function
Surly you can return value from ChaiScript. It is also done by the keyword return. However, unlike C/C++. A function isn’t limited to returning a single type of value. (Ex: a function int foo(int x) have to return an integer value).
Thus the following function is valid in ChaiScript.
def foo(num)
{
if(num%2 == 0)
return "Odd"
return False
}
Assigning a function to a variable
A ChaiScript function in the interpolator std::function. Thus you can assign a ChaiScript function to a variable(which makes the variable that is a function) or get a std::function in C++ that calls the ChaiScript Function. We will talk about calling ChaiScirpt functions later. I’m going to demonstrate how to assigning a ChaiScript function to a variable, then call it. I’s easy
def f()
{
return 42
}
var func = f
//call it
print(func())
That’s it. Simple!
This ends this short tutorial. We will be talking about calling ChaiScript functions from C++ in the next tutorial. It is available here.
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