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Added info about evaluation of default parameters

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See issue #573 for reasoning.
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Mathias Bockwoldt 2018-11-14 09:47:30 +01:00 • committed by GitHub
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1-js/02-first-steps/14-function-basics/article.md
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@ -204,6 +204,10 @@ function showMessage(from, text = anotherFunction()) {
}
```
```smart header="Evaluation of default parameters"
In JavaScript, a default parameter is evaluated every time the function is called without the respective parameter. In the example above, `anotherFunctions()` is called everytime `someMessage()` is called without the `text` parameter. This is in contrast to some other languages like Python, where any default parameters are evaluated only once during the initial interpretation.
```
````smart header="Default parameters old-style"
Old editions of JavaScript did not support default parameters. So there are alternative ways to support them, that you can find mostly in the old scripts.