Интерфейс в JavaScript
// example duck typing method
var hasMethods = function(obj /*, method list as strings */){
var i = 1, methodName;
while((methodName = arguments[i++])){
if(typeof obj[methodName] != 'function') {
return false;
}
}
return true;
}
// in your code
if(hasMethods(obj, 'quak', 'flapWings','waggle')) {
// IT'S A DUCK, do your duck thang
}
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