nullish coalescing

SLIDE 1
	no	if(!rating) rating = "Unrated coontent"
	no      rating = rating || "Unrated content"
	yes	rating = rating ??  "Unrated content"
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The nullish coalescing operator (??) is a logical operator that returns its right-hand side operand when its left-hand side operand is null or undefined, and otherwise returns its left-hand side operand.

Unexpected behaviour is seen with logical OR(||) operator, as 0, "", [] etc. are treated as falsy value.
In previous example

let user = {rating: 0}
rating = user.rating || "Unrated content"
console.log(rating) // expected 0 but output is Unrated Content

SLIDE 3
Browser Support
Chrome 80+
Firefox 72+
Edge    80+
safari  13.1
IE	No


SLIDE 4
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