Interpolation and External Arguments

Strings in FTL may use special syntax to incorporate small pieces of programmable interface. Those pieces are denoted with curly braces { and } and are called placeables.

It's common to use placeables to interpolate external arguments into the translation. External arguments are provided by the developer and may change on runtime.

welcome = Welcome { $user }
unreadEmails = { $user } has { $emailCount } unread emails.
    "user": "Jane",
    "emailCount": 5

There are all kinds of external data that might be useful in providing a good localization: user names, number of unread messages, battery level, current time, time left before an alarm goes off, etc.

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