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What is the function of the var keyword and when to use it (or omit it)?

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What exactly is the function of the var keyword in Javascript, and what is the difference between:

var someNumber = 2;
var someFunction = function() { doSomething; }
var someObject = { }
var someObject.someProperty = 5;

and:

someNumber = 2;
someFunction = function() { doSomething; }
someObject = { }
someObject.someProperty = 5;

When would you use either one, and why/what does it do?

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