I have the following code:
var intrebari = new Array();
var i = 0;
intrebari[i]['enunt'] = 'test';
alert(intrebari[i]['enunt']);
The problem is that when I run it it says that intrebari is undefined. Why?
3 Answers
Yes interbari[0] is null , so it cannot be object - and for adding into array use push instead of indexes
var intrebari = [];
intrebari.push({ 'enunt': 'test' });
alert(intrebari[i]['enunt']);
This will work
1 Comment
Pointy
Alternatively,
intrebari[i] could be set to just {}, and then that assignment in the original would work. But this answer is correct.var intrebari = new Array();
var i = 0;
intrebari[i] = new Object()
intrebari[i]['enunt'] = 'test';
alert(intrebari[i]['enunt']);
3 Comments
Pointy
No, it shouldn't be a new Array; it's being used with a string key, so it should more likely be an object.
Gaurav
@Pointy : fixed it. But is this the only reason of using object instead of array.
Pointy
Well, arrays have their own behaviors. It works to use an array as an object, because arrays are objects. But there can be strange effects sometimes if the programmer is not very aware of exactly how things work.
You need to assign something to intrebari[i] before you can access any properties of it, "by default" its value is undefined that doesn't have any properties. For example:
intrebari[i] = new Object();
intrebari[i]["enunt"] = "test";
alert(intrebari[i]["enunt"]);
[]is the same as "new Array()", and{}is the same as "new Object()". Just to save you some typing :-)