this within a function is dynamically set at runtime:
var person = {
hello: function(thing) {
console.log(this, " says hello " + thing);
}
}
// the code:
person.hello("world");
// is similar to:
person.hello.call(person, "world");
Is there a way, after binding a function to an object, to retrieve that object from a reference to the bound function? For example:
var mysteryFunction = person.hello;
mysteryFunction.getMyRuntimeThis() // returns: person
Python and JavaScript have different ways of handling objects, so directly transferring methods is not feasible. One workaround is to create a new object with all methods bound to it:
var bindMethodsToObject = function(obj) {
var newObj = {};
Object.keys(obj).forEach(function(key) {
var value = obj[key];
if(value.bind)
value = value.bind(obj);
newObj[key] = value;
});
return newObj;
}
//
var person = {
name: 'Joe',
greet: function(thing) {
console.log(this.name + " says hello " + thing);
}
}
var sayHello = bindMethodsToObject(person).greet;
sayHello('there')A more efficient way to achieve this is by using proxies.
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