using reduce for updating nested object vs destructuring

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using reduce for updating nested object vs destructuring

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Last edited Jan 13, 2018

Created on Jan 13, 2018

This example contrasts two JavaScript techniques for updating a nested object in response to user interaction, using a simple bar chart built with D3.js. It shows a `reduce` method that iteratively rebuilds the object and a destructuring approach that spreads the previous state, both updating a count property. The data is a small hardcoded array of items, and clicking a button triggers the update, with the resulting chart rendered as SVG rectangles. The visualization highlights the syntactic and structural differences between the two state-management patterns.

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