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Alex Rivera
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The basic example: var b = 10; var c = b; b++; console.log(b,c); >> 11 10 c looks like a copy of b . But in another case: var x = {}; var y = x; x.abc = 10; console.log(x.abc, y.abc); >> 10 10 Why is the y not a copy of x , but a reference which points to the same instance x points to? Also, I guessed b++ creates another instance, so b points to the new instance but c points to the old one. However... var u = 10; setTimeout(function() { console.log(u); }, 10000) u++; >> 11 If u++ creates a new instance, then the u inside the anonymous function should point to the old u , shouldn't it?
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