Could you clarify if either of these examples depend on undefined behavior, and if there is a way to modify them to avoid it:
Sample 1:
var str = {
ver: '1.01',
verdesc: 'WIP',
composite: {
version_block: str.ver + str.verdesc
}
}
Sample 2:
var str = {
ver: '1.01',
verdesc: 'WIP',
},
composite: {
version_block: str.ver + str.verdesc
};
When referencing a property defined within an object literal from within the same object literal, it is not possible. The properties are only assigned to the variable after the entire object literal has been evaluated. Therefore, you cannot reference properties of the variable within the object literal itself.
If you assign an object literal to a variable like this:
var data = { ... };
you will not be able to use the reference data inside the object literal. This is because at the time of evaluation, data is still undefined. It is only after the object literal has been fully parsed and evaluated that the Object value is created and assigned to data.
var data = {
x: 456,
y: data.x // this will throw an error as "data" is undefined
};
data.y = data.x; // this will work fine
http://jsfiddle.net/kendfrey/XwVFt/
The message of error provides all the details.
It is not permissible to do that. The properties of the variable cannot be accessed until after the variable has been assigned, which occurs once the entire object has been created.
To resolve this issue, you need to assign the object first and then proceed to set its properties.
var str = { };
str.ver = '1.01';
str.verdesc = 'WIP';
str.composite = {
version_block: str.ver + str.verdesc
}
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