// Signal how many bytes we wrote
Transforms don't execute until the consumer pulls. There's no eager evaluation, no hidden buffering. Data flows on-demand from source, through transforms, to the consumer. If you stop iterating, processing stops.
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It’s easy to balk at its price tag, but this camera offers a level of flexibility that could save you money in the long run if you use it a lot. That’s because the Instax Mini Evo includes a full-color three-inch LCD screen that lets you preview and select which images you want to print, which can help you avoid wasting film on unwanted shots. The added flexibility gave me more room for creative experimentation, too, as I wasn’t worried about running out of film. I also loved using the Instax Mini Evo app to print photos from my smartphone. Plus, unlike the Instax Mini 12, the Evo now uses a USB-C port (though older black models still use the Micro USB port) for charging, so you don’t need to keep buying new batteries.