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Audra Ogilvy3,142 Points
Using the var keyword versus just using =
Steven Parker221,328 Points
It depends on where it is done.
In global scope, they are the same. But in a function, "var" creates a variable limited to the scope of the function, but an implicit declaration creates (or alters) a global variable.
But implicit declarations are not considered good programming practice, and when the system is in "strict" mode, they are not allowed at all and cause an error.