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Added 'use strict'; directive to Chapter 04.0 for code correctness #66

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Added 'use strict'; directive to Chapter 04.0 for code correctness #66

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3 changes: 3 additions & 0 deletions chapters/ch04.0-logtar-our-logging-library.md
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Expand Up @@ -340,6 +340,9 @@ module.exports = {
Let's try to test this.

```js

'use strict';

new Logger("OK"); // throws error
new Logger(LogLevel.Debug); // works fine
new Logger(); // works fine
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