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Document is_number filter and function (#19487)

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Erik Montnemery 2021-09-27 10:48:18 +02:00 committed by GitHub
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@ -479,14 +479,14 @@ Closest to some entity:
{% endraw %}
### Formatting
- `float` will format the output as float.
### Numeric functions and filters
Some of these functions can also be used in a [filter](https://jinja.palletsprojects.com/en/latest/templates/#id11). This means they can act as a normal function like this `sqrt(2)`, or as part of a filter like this `2|sqrt`.
- `float` function will attempt to convert the input to a `float`. If that fails, return the input value.
- `float` filter will attempt to convert the input to a `float`. If that fails, returns `0.0`.
- `is_number` will return `True` if the input can be parsed by Python's `float` function and the parsed input is not `inf` or `nan`, in all other cases returns `False`. Note that a Python `bool` will return `True` but the strings `"True"` and `"False"` will both return `False`. Can be used as a filter.
- `log(value, base)` will take the logarithm of the input. When the base is omitted, it defaults to `e` - the natural logarithm. Can also be used as a filter.
- `sin(value)` will return the sine of the input. Can be used as a filter.
- `cos(value)` will return the cosine of the input. Can be used as a filter.