The Science of Programming/SwayPresentations/Objects/Examples4

 Examples 

How about try blocks? Using the Sway proximal block style:

var error; try (error) {       a / b;        } else if (error . type == :undefinedVariable) {       println("try block has an undefined variable"); }   else {       println("try block has a divide error"); }

Here's the implementation:

function try($store,$code,$) {       var result = catch(force($code)); if (error?(result)) {           $store = result; if ($ != :null,force(car($))); }       else {           result; }       }

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