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Add note about default arguments

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Original file line number	Diff line number	Diff line change
`@@ -176,6 +176,10 @@ function paintCar(car) {`
`176`	`176`	`[⬆ back to top](#table-of-contents)`
`177`	`177`
`178`	`178`	`### Use default arguments instead of short circuiting or conditionals`
	`179`	`+Default arguments are often cleaner than short circuiting. Be aware that if you`
	`180`	+use them, your function will only provide default values for `undefined`
	`181`	+arguments. Other "falsy" values such as `''`, `""`, `false`, `null`, `0`, and
	`182`	+`NaN`, will not be replaced by a default value.
`179`	`183`
`180`	`184`	`Bad:`
`181`	`185`	```javascript

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