optionjs

Implement option type for javascript.

Load module

var _option = require("optionjs");

Create an option object

Create an option object from value.

var option = _option(value);

Create an option object from function.

var obj = undefined;
var option = _option(function(){ return obj.a.b.c; });

Use it Functional

You can map it to an new option.

var new_option = option.map(function(val){ return val + 1 ; })
//Note: map function was called only when option's val is not null.

And you can do match/case in funcional way.

var new_option = option.match(function(val){
  return val + 5;
}, function(){
  return 5;
});
//This two funcion params are case_some and case_none, you know.

Get the value

var val = option.get(); //may throw an "None.get" exeption
var val = option.getOrElse(5);
var val = option.getOrUndefined();

Have fun!