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Ilya Kantor 2018-11-26 12:22:27 +03:00
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1-js/02-first-steps/04-variables/article.md
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# Variables
Most of the time, a JavaScript application needs to work with information. Here are 2 examples:
1. An online-shop -- the information might include goods being sold and a shopping cart.
1. An online-shop -- the information might include goods being sold and a shopping cart.
2. A chat application -- the information might include users, messages, and much more.
Variables are used to store this information.
@ -221,14 +221,13 @@ alert(num); // 5
That's a bad practice, it gives an error in the strict mode:
```js run untrusted
```js run refresh untrusted
"use strict";
*!*
num = 5; // error: num is not defined
*/!*
```
````
## Constants