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Using arrow function as callback function can reduce lines of code. The default syntax for arrow function is () => {} This can be used as callbacks For example if we want to print all elements in an array [1,2,3,4,5] without arrow function, the code will look like this [1,2,3,4,5].forEach...

var sck = "wss://site.com/wss-handler"; var wss = new WebSocket(sck); This uses the wss instead of ws to make a secure web socket connection which make use of HTTPS instead of HTTP