Say I have an object as below,
var ob = {}
Now I want to assign value to it as following
ob = {
data: {
id: '123456'
}
}
I tried ob.data.id = '123456', it prompts me that
TypeError: Cannot set property 'id' of undefined
Unless I make it this way
ob.data = {}
ob.data.id = '123456'
I'm wondering if there a easier/elegant way to achieve the same goal here? Much appreciated.
var ob = {};
ob.data.id = '123456';
The above code gives an error because, you have initialized the variable ob as an object but in the next line, you are trying to add a property id to ob.data. Here ob.data is not yet defined (undefined).
var ob = {};
ob.data = {};
ob.data.id = '123456';
This code works because, first you have initialized the variable ob as an object and then you have added a property data to it which is also an object and then finally adding the id property to the ob.data object.
As pointed out in the comment by @Lewis, you can combine the last two statements to a single statement as shown below.
var ob = {};
ob.data = {id: '123456'};
This would give the same result.
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