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move misc to js/ui

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Ilya Kantor 2019-06-22 10:17:44 +03:00
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1-js/99-js-misc/02-eval/1-eval-calculator/solution.md Normal file
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Let's use `eval` to calculate the maths expression:
```js demo run
let expr = prompt("Type an arithmetic expression?", '2*3+2');
alert( eval(expr) );
```
The user can input any text or code though.
To make things safe, and limit it to arithmetics only, we can check the `expr` using a [regular expression](info:regular-expressions), so that it only may contain digits and operators.