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I'm trying to do someting like
o = { a: { foo: 42 }, b: o.a } But that returns an error saying o is not defined. I know I can later do o.b = o.a. But I'm wondering if it's possible to define b while I'm in defining o.
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Objects are assigned and copied by reference. In other words, a variable stores not the “object value”, but a “reference” (address in memory) for the value. So copying such a variable or passing it as a function argument copies that reference, not the object itself.
For reference type like objects, == or === operators check its reference only. here a==b will be false as reference of both variables are different though their content are same. and if i check now a==b then it will be true , since reference of both variable are same now.
This is ancient history now, but I just learned about getters and setters, which are perfect for your situation, and I'm sure people looking at this issue could get some value from it..
o = { a: { foo: 42 }, get b() { return this.a } } console.log(o.b) // => { foo: 42 } If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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