another approach is to create a function that checks if the param is
undefined and store a reference to it on to the local scope for brevity.. in
many cases it will be clearer (specially if you have multiple calls)..
function isDef(param){
//return typeof param !== 'undefined'; //if you prefer not to use
`void(0)`
return param !== void(0);
}
then check:
if(isDef(foo)){
alert(foo);
}
instead of:
if(foo !== void(0)){
alert(foo);
}
if you use google closure compiler it will inline the calls to `isDef()` so
there is no excuse about performance being worse or anything like that..
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