frp-d ~master

FRP-D: Functional Reactive Programming Library for D

This library is built from the ground up in order to take full advantage of some of Ds unique features.

Basic Usage

Cell Usage

void main() {
    auto a = cell!int(1);
    auto b = cell(2);
    
    auto product = cf!mul(a,b);
    auto currentProduct = mul(a.value,b.value);
    writeln("`product` is a: `Cell!int`");
    writeln("`currentProduct` is a: `int`");
    
    writeln(a.value," * ",b.value," = ",product.value);
    a.value = 2;
    writeln(a.value," * ",b.value," = ",product.value);
    b.value = 3;
    writeln(a.value," * ",b.value," = ",product.value);
    
    writeln("but `currentProduct` never changed: ",currentProduct);
}

Stream Usage

void main() {
    auto a = stream!int;
    auto b = stream!int;
    
    auto a3 = a.map!triple;
    auto a3b = join!((int[] l, int[] r)=>l~r)(a3,b);
    
    a3.addListener!((int v){writeln("Event in `a3`: ",v);});
    a3b.addListener!((int v){writeln("Event in `a3b`: ",v);});
    
    writeln("Order of listeners being called from events from the same source is undefined. (More technically, events in the same transaction.");
    a.put(1);
    writeln("--- Transation break.");
    b.put(2);
    writeln("--- Transation break.");
    a.put(5);
    writeln("--- Transation break.");
    a.put(6);
}

Contributing

If you have an interest is seeing a good FRP library native in D, join in the fun! I love colaborating!

If you have questions just ask.