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Add warning to isset function for lowercase site config keys

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Ryan Watters committed 2017-03-31 18:46:14 -05:00
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content/functions/isset.md
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@@ -17,10 +17,13 @@ deprecated: false
aliases: [] aliases: []
--- ---
`isset` returns true if the parameter is set. `isset` returns true if the parameter is set. Takes either a slice, array, or channel and an index or a map and a key as input.
Takes either a slice, array or channel and an index or a map and a key as input.
``` ```
{{ if isset .Params "project_url" }} {{ index .Params "project_url" }}{{ end }} {{ if isset .Params "project_url" }} {{ index .Params "project_url" }}{{ end }}
``` ```
{{% warning %}}
All site-level configuration keys are stored as lower case. Therefore, a `myParam` key-value set in your [site configuration file](/getting-started/configuration/) needs to be accessed with `{{if isset .Site.Params "myparam"}}` and *not* with `{{if isset .Site.Params "myParam"}}`. Note that you can still access the same config key with `.Site.Params.myParam` *or* `.Site.Params.myparam`, for example, when using [`with`](/functions/with).
{{% /warning %}}