If I have this in javascript
var x = {
"a" : function(q) { return q+1; },
"b" : function(w) { return (this["a"])(1); }
};
I want to do something, like access functions from the same object but different properties.
For example, in the above code, property a should be fine, but in property b, I want to use the function stored in a. Currently for fun I just have this["a"] which probably doesn't work. But is there a way I can get that function?
Thanks
What you have actually works. Have a look at this fiddle here with your object..
Javascript
var x = {
"a" : function(q) { return q+1; },
"b" : function(w) { return (this["a"])(1); }
};
document.body.innerHTML = x.b();
The result from calling x.b() is 2.
More complex objects can do it to like:
var myObj = {
myFunction: function(testVar)
{
return this.Utilities.helperFunction(testVar);
},
Utilities: {
helperFunction: function(anotherVar)
{
return anotherVar * 2;
}
}
}
You may also notice that in this second example I use a different syntax for getting the property of the object. You can use either this["a"] or this.a which both return the same result. The reason you would use this["a"] is when you want to pass a variable in to grab the property or function.
Just need to print it to the display:
var x = {
"a" : function(q) {
return q+1;
},
"b" : function(w) {
return (this.a)(1);
}
};
document.write(x.b(1));
see this awesome overview of this: How does the "this" keyword work?
it goes one level up the chain; inside a function, this is the next level of scope above function, so in the case of x.b=function() {this //}, this looks 1 level up the scope and gets to x.
