Articles, podcasts and news about Swift development, by John Sundell.

Configurable types

Published on 26 Jun 2019

A big benefit of making types configurable by closures, rather than hard-coding their behaviors, is that it makes it trivial to add new capabilities. For example, here’s how I'm adding a Splash plugin to my upcoming static site generator using a configurable type:

extension PipelineBuilder {
    mutating func splash() {
        customStep { context in
            context.siteMap.transformItems { item in
                item.body = MarkdownDecorator().decorate(item.body)

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