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Mention the significance of leading 0 in int fn string input

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https://discourse.gohugo.io/t/unable-to-cast-09-of-type-string-to-int/9614
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Kaushal Modi 2017-12-15 11:58:37 -05:00 committed by Bjørn Erik Pedersen
parent 07f4987556
commit daf6f51c0b
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content/functions/int.md
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@ -24,3 +24,28 @@ Useful for turning strings into numbers.
```
{{ int "123" }} → 123
```
{{% note "Usage Note" %}}
If the input string is supposed to represent a decimal number, and if it has
leading 0's, then those 0's will have to be removed before passing the string
to the `int` function, else that string will be tried to be parsed as an octal
number representation.
The [`strings.TrimLeft` function](/functions/strings.trimleft/) can be used for
this purpose.
```
{{ int ("0987" | strings.TrimLeft "0") }}
{{ int ("00987" | strings.TrimLeft "0") }}
```
**Explanation**
The `int` function eventually calls the `ParseInt` function from the Go library
`strconv`.
From its [documentation](https://golang.org/pkg/strconv/#ParseInt):
> the base is implied by the string's prefix: base 16 for "0x", base 8 for "0",
> and base 10 otherwise.
{{% /note %}}