RSS Feed/News Display a variable as a 'simple' number

[ENXF NET]

Hi
How can I display a number variable as a 'simple' number in a template?

Example code:
HTML:

{{ $cost ? $cost : phrase('free') : }}
i.e. instead of displaying the $cost variable as 5.00 USD I'd like to simply display[COLOR=hsl(var(--xf-editorFocusColor))] [/COLOR]5.
Is there a built in function I can use, or only use JavaScript?
I found this post:
https://xenforo.com/community/threads/xf-template-functions.177272/#post-1410553
But can't figure out how to use the functions (and if they are...

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