As the proper developer, you should separate each statement with a semicolon.
Statements should be placed in blocks for organization and clarity.
Remember that programming is not just about making things work, but allowing others to read and understand your code. This often means that you should find a good middle-ground between a code's efficiency and readability.
Comments are also helpful to prevent execution of part of a code when you're trying to debug. Simply comment out the part you don't want to run.
// Comments precede a double slash /* Or go between the slash asterick notation like so */
var greeting = "Hello"; var greeting="Hello" ;
It's better to opt for the former, which allows for better readability.
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