The method you'll need to scan a document on a Mac depends on what kind of scanner you have. Here's how to set up nearly any scanner on a Mac.

You can scan a QR code using the camera on your smartphone, tablet, or computer — however, you may need to download an app.

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The simplest way to think about SCAN is that it applies a custom calculation to each element in a range/array and returns every intermediate result it produces along the way. If that sounds abstract, ...