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Added a dot notation example

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Lines changed: 12 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -105,7 +105,6 @@ That's because the dot requires the key to be a valid variable identifier. That`
`105`	`105`
`106`	`106`	`There's an alternative "square bracket notation" that works with any string:`
`107`	`107`
`108`		`-`
`109`	`108`	```js run
`110`	`109`	`let user = {};`
`111`	`110`
`@@ -130,7 +129,7 @@ let key = "likes birds";`
`130`	`129`	`user[key] = true;`
`131`	`130`	```
`132`	`131`
`133`		-Here, the variable `key` may be calculated at run-time or depend on the user input. And then we use it to access the property. That gives us a great deal of flexibility. The dot notation cannot be used in a similar way.
	`132`	+Here, the variable `key` may be calculated at run-time or depend on the user input. And then we use it to access the property. That gives us a great deal of flexibility.
`134`	`133`
`135`	`134`	`For instance:`
`136`	`135`
`@@ -146,6 +145,17 @@ let key = prompt("What do you want to know about the user?", "name");`
`146`	`145`	`alert( user[key] ); // John (if enter "name")`
`147`	`146`	```
`148`	`147`
	`148`	`+The dot notation cannot be used in a similar way.`
	`149`	`+`
	`150`	+```js run
	`151`	`+let user = {`
	`152`	`+ name: "John",`
	`153`	`+ age: 30`
	`154`	`+};`
	`155`	`+`
	`156`	`+let key = "name";`
	`157`	`+user.key // undefined`
	`158`	+```
`149`	`159`
`150`	`160`	`### Computed properties`
`151`	`161`

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