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Update higher-order-functions.md: add warning about $map()'s retu… #723

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Update higher-order-functions.md: add warning about $map()'s retu… #723

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7 changes: 7 additions & 0 deletions docs/higher-order-functions.md
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Expand Up @@ -9,6 +9,13 @@ __Signature:__ `$map(array, function)`

Returns an array containing the results of applying the `function` parameter to each value in the `array` parameter.

> :warning: **If your array has exactly one item the returned value won't be an array.** Only that single item will be returned.
>
> In this case, to have the return of `$map()` be a array, please append `[]` to the closing parenthesis of the `$map()` function:
```
$map([1], $string)[]
```

The function that is supplied as the second parameter must have the following signature:

`function(value [, index [, array]])`
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