F - Definitions
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F
feature flagging
Feature flagging is a simple programming design pattern that allows developers to turn application features on or off without having to redeploy or change code already in production.
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foo (in software programming)
Foo (pronounced FOO) is a term used by programmers as a placeholder for a value that can change depending on conditions or on information passed to the program.
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functionality
In information technology, functionality (from Latin functio meaning "to perform") is the sum or any aspect of what a product, such as a software application or computing device, can do for a user.