New Package: Closure

[Mahmoud Fayed]

Hello

I have already added a new package called Closure

It's useful for functional programming where we can create an anonymous function that capture specific variables. 

Using closure() capture variables by value. For lists/objects we can change this behaviour (optional) using the Ref() function. The first parameter to closure() is a list of variables to capture we can type

(1) :variable_name

Or

(2) :variable_name = value

Or

(3) :variable_name = ref(list/object)

The second parameter is an anonymous function that could use the captured variables

Source Code: ring/libraries/closure/closure.ring at master · ring-lang/ring

Install

ringpm install closure from ringpackages

Example:

load "closure.ring"

func main

inc = increment()

? isClosure(inc) # Prints 1

? invoke(inc) # Prints 11
? invoke(inc) # Prints 12

for m = 1 to 1000
invoke(inc)
next

? invoke(inc)

dec = decrement()
? invoke(dec)
? invoke(inc)
? invoke(dec)

func increment

x = 10

return closure([:x], func {
x++
return x
})

func decrement

x = 100

return closure([:x], func {
x--
return x
})

Output:

1
11
12
1013
99
1014
98

Greetings,

Mahmoud

[Mansour Ayouni]

Hello Mahmoud,

Thank you for adding this feature to Ring!

Now we can let anonymous functions carry with them their context, act on it even if the outer function has terminated, and enable some sophisticated programming scenarios.

I would like to share this nice explanation of closures for those who need it:

https://www.youtube.com/watch?v=rBBwrBRoOOY

All the best,

Mansour

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[Mahmoud Fayed]

Hello Mansour

You are welcome :D

Greetings,

Mahmoud