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Difference between using var and not using var in JavaScript
For the code, I found it is no need to declare variable using var. the following are both working
// with var
var object = new Object();
// without var
object = new Object();
what's the difference between those two?
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In Java 10, the var keyword allows local variable type inference, which means the type for the local variable will be inferred by the compiler, so you don't need to declare that.
By using “var”, you are giving full control of how a variable will be defined to someone else. You are depending on the C# compiler to determine the datatype of your local variable – not you. You are depending on the code inside the compiler – someone else's code outside of your code to determine your data type.
let allows you to declare variables that are limited in scope to the block, statement, or expression on which it is used. This is unlike the var keyword, which defines a variable globally, or locally to an entire function regardless of block scope.
the key difference is if you don't use var keyword, your variable will be global, even if you defined it in some nested function.
var defines a scope for that variable. Using a global or not depends if you want to use your object across multiple scopes or not, but globals are strongly discouraged in favour of namespaces that reduce the global scope pollution.
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