Functions

Functions can be used in Fluent to format data according to the current language’s rules, or can provide additional data to fine tune the translation.

Fluent includes some generic built-in functions, like NUMBER and DATETIME, for number and date formatting, respectively. Such functions can be used in placeables and selectors. For example:

dpi-ratio = Your DPI ratio is { NUMBER($ratio, minimumFractionDigits: 2) }

your-score = { NUMBER($score, minimumFractionDigits: 1) ->
        [0.0]   You scored zero points. What happened?
       *[other] You scored { NUMBER($score, minimumFractionDigits: 1) } points.
    }

This document describes additional functions available in Gecko products. Please refer to this document for references about the terminology used.

PLATFORM

PLATFORM is a function that allows localizers to tailor messages to the current platform. Allowed variant keys are: windows, macos, linux, android, other.

For example, Firefox settings are currently called Options in Windows, Preferences in macOS and Linux. Strings can be differentiated in Fluent by defining a message as follows:

pref-page =
    .title = { PLATFORM() ->
        [windows] Options
       *[other] Preferences
    }

PLATFORM() is used to determine the variant to use in the select expression, other is defined as default. If a variant isn’t defined, for example for linux, it will fall back to the default value.

The following example uses the PLATFORM() function for each attribute:

download-choose-folder =
    .label =
        { PLATFORM() ->
            [macos] Choose…
           *[other] Browse…
        }
    .accesskey =
        { PLATFORM() ->
            [macos] e
           *[other] o
        }

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