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Fix misleading info on the difference between "using" and "import" #47614

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Feb 10, 2023
Merged

Fix misleading info on the difference between "using" and "import" #47614

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4e7df42
Fix #43425
udohjeremiah Nov 17, 2022
75ddddd
Update faq.md
udohjeremiah Nov 20, 2022
a8a8aa6
Update doc/src/manual/faq.md
udohjeremiah Nov 21, 2022
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11 changes: 7 additions & 4 deletions doc/src/manual/faq.md
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Expand Up @@ -818,10 +818,13 @@ to strings); similarly, `repeat` can be used instead of `^` to repeat strings. T

### What is the difference between "using" and "import"?

There is only one difference, and on the surface (syntax-wise) it may seem very minor. The difference
between `using` and `import` is that with `using` you need to say `function Foo.bar(..` to
extend module Foo's function bar with a new method, but with `import Foo.bar`,
you only need to say `function bar(...` and it automatically extends module Foo's function bar.
Aside the other differences between `using` and `import`
(see the [Modules section](https://docs.julialang.org/en/v1/manual/modules/#modules)),
one difference is very worthy of mention, because it might not seem intuitive at first glance,
and on the surface (syntax-wise) it may seem very minor. This difference is that with `using`
you need to say `function Foo.bar(...` to extend module `Foo`'s function `bar` with a new method,
but with `import Foo.bar`, you only need to say `function bar(...` and it automatically extends
module `Foo`'s function `bar`.

The reason this is important enough to have been given separate syntax is that you don't want
to accidentally extend a function that you didn't know existed, because that could easily cause
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