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I see it in some contract examples, but it doesn't look like it has the exact same purpose as regular JavaScript. Can it be used to initialize variables in a specific scope without declaring a type?

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  • Where did you see that? Commented Jun 15, 2017 at 6:24

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From the docs:

Type Deduction

For convenience, it is not always necessary to explicitly specify the type of a variable, the compiler automatically infers it from the type of the first expression that is assigned to the variable:

uint24 x = 0x123; var y = x;

Here, the type of y will be uint24. Using var is not possible for function parameters or return parameters.

This is also a must for Destructuring Assignments

function f() public pure returns (uint, bool, uint) { return (7, true, 2); } var (x,y,z) = f(); //Multi-Return from Fx (x,y) = (y,x) //Swap Values
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