Tag: Lenses
All the articles with the tag "Lenses".
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Stop Building Spread Pyramids: Composable Focus in TypeScript
Changing one string five levels down means rebuilding every object on the way back up, by hand, in a pyramid of spreads where the bug is never in the value you meant to change. A lens turns that path into a value you can name, compose, and reuse, and the pyramid collapses to one line.