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patchAttrs

As explained in Build a Frontend Web Framework (From Scratch)

patchAttrs is a book-specific function that updates DOM element attributes to match virtual-node properties.

patchAttrs updates a DOM element’s ordinary attributes so they match the properties of a new virtual node. It receives the old and new attribute objects after class, style, and event properties are separated. section 8.2.5

Attribute reconciliation

Given old and new attribute objects, patchAttrs removes attributes no longer present and applies values for newly added or changed attributes. Classes, styles, and event handlers follow separate patching functions. section 8.2.5

How Build a Frontend Web Framework (From Scratch) covers it

How deep it goes
Implements diff-driven removal and assignment, while deferring classes, styles, events, and child nodes to separate mechanisms.
Examples
Uses ordinary attributes such as id, name, and value, then removes, adds, or updates them.
What it assumes
Assumes virtual-node props and object-difference results while teaching attribute reconciliation through a small function.
What you can do after
Build it from scratch using objectsDiff(), removeAttribute(), and setAttribute().
How it connects
Connects virtual nodes, DOM elements, object differences, and element reconciliation.
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This explainer was generated by Manning's knowledge graph from the text of Build a Frontend Web Framework (From Scratch). The section links point to the parts of the book it draws on.