Javascript: Function with optional argument
Well optional argument is essential feature when it comes to re usability of your code. But its not given in js as simple as its given in PHP & other languages. But with some simple trick you can also achieve the same.
For e.g.
function calCulate(val1, val2, operator){
if(!operator){
operator = 'plus';
}
switch(operator){
case 'plus':
return val1 + val2;
break;
case 'minus':
return val1 - val2;
break;
}
}
alert(calCulate(1,2));
alert(calCulate(2,1,'minus'));this is it and now you have optional argument in your Javascript code

