Javascript Object: Map of Functions. How to return default value -

sorry title of question, don't found better one.

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introduction

my goal create object, , associate every params function. simple!

var canidothis = {     one: function(a, b, c){},     two: function(a){},     three: function(){} } 

i want call canidothis in way

if(canidothis['one'](x, y, z)) {     // somthing }  if(canidothis['two'](w)) {     // somthing }  if(canidothis['three']()) {     // somthing } 

if have var can "one", "two" or "three" can use canidothis in way

// myvariable can equalso "one" or "two" or "three" var myvarable;  if(canidothis[myvarable]()) {     // somthing } 

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my problem

i'd manage myvarable value. if call canidothis['four']() uncaught typeerror: undefined not function

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my question

is there way prevent default behaviour of uncaught typeerror , return default value? cute if canidothis['four']() interpretated false or undefined

ps: in pure javascript ;)

try checking if property function before calling using typeof.

if (typeof(canidothis[myvarable]) === 'function') {     canidothis[myvarable](); }