How deeply does D3.js in Action, Third Edition cover array iterator method?

Defines forEach(), map(), filter(), and find() with short dataset examples, but does not survey all manipulation techniques.

Array iterator method

As explained in D3.js in Action, Third Edition

An array iterator method is a JavaScript array method that traverses elements while producing a test result or transformed selection.

Array iterator methods traverse dataset elements to inspect, transform, select, or locate values. They are especially useful during data wrangling for visualizations. section 1.2.5

Preparing employee data

Given an employee array, run data.forEach(d => { d.id = +d.id; }); before using map(), filter(), or find() for visualization work.

How D3.js in Action, Third Edition covers it

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Related concepts

findincludes · A find operation searches a collection for the first element or entry matching a value or predicate and returns it, or indicates that no match exists.
mapincludes · An operation that applies a function to values in a collection or computational context, producing corresponding results while preserving the collection or context’s structure.
Array.prototype.filterincludes · Array.prototype.filter is a JavaScript method that returns a new array containing the elements for which a callback predicate returns a truthy value.

This explainer was generated by Manning's knowledge graph from the text of D3.js in Action, Third Edition. The section links point to the parts of the book it draws on.