cue-list-or-field-comprehension.cue

import "strings"

band: {
	// hidden fiels
	_selfIndexAlbums: ["", "II", "III", "IV"]
	_namedAblums: [
		"Houses of the Holy",
		"Physical Graffiti",
		"Presence",
		"In Through the Out Door",
		"Coda",
	]

	name: "Led Zeppelin"

	// List comprehension
	selfTitled: [
		for i, I in _selfIndexAlbums {title: "\(name) \(I)"},
	]

	// nested list comprehension
	allAlbums: [
		for i, I in _selfIndexAlbums {title: "\(name) \(I)"},
		for N in _namedAblums { title: "\(N)" }
	]

	Albums: {
		for key, val in allAlbums {
			"\(strings.TrimSpace(val.title))": {
				pos: key,
				artist: name,
				title: strings.TrimSpace(val.title),
				titleLen: len(val.title)
			}
		}
	}

}


- list comprehension: `[ for key, val in iterable { ... } ]`. Notice you can leave the key off, and you just get the value.
- field comprehension: `[ for key, val in iterable { ... } ]`. We've interpolated a field name by calling a builtin, notice the surrounding quotes.
- string interpolation: `"\(<a cue expression)"`. These are based on Swift's string interpolation, and it's the only valid mechanism when you want to be JSON compatible.
- hidden fields: `_hidden: "I'm hidden"` which begin with an underscore. There are also hidden definitions (`_#`)