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nullish coalescing operator

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Original file line number	Diff line number	Diff line change
`@@ -374,3 +374,19 @@ window.addEventListener('contextmenu', ()=>{`
`374`	`374`	`//With defer, browser will run your script when the page finished parsing. (not necessary finishing downloading all image files.`
`375`	`375`	`<scriptdefersrc="myscript.js"></script>`
`376`	`376`	```
	`377`	`+`
	`378`	`+# nullish coalescing operator`
	`379`	+```javascript
	`380`	`+`
	`381`	`+// an equality check against nullary values (e.g. null or undefined). Whenever the expression to the left of the ?? operator evaluates to either //undefined or null, the value defined to the right will be returned.`
	`382`	`+`
	`383`	`+constfoo=undefined??'default string';`
	`384`	`+console.log(foo);`
	`385`	`+// expected output: "default string"`
	`386`	`+`
	`387`	`+`
	`388`	`+constage=0??30;`
	`389`	`+console.log(age);`
	`390`	`+// expected output: "0"`
	`391`	+```
	`392`	`+`

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